Unify the void cast usage

1.Remove void cast for function because many place ignore the returned value witout cast
2.Replace void cast for variable with UNUSED macro

Change-Id: Ie644129a563244a6397036789c4c3ea83c4e9b09
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>

builtin/exec_builtin.c

@@ -217,15 +217,15 @@ int exec_builtin(FAR const char *appname, FAR char * const *argv,
    * be set appropriately).
    */
 
-  (void)posix_spawn_file_actions_destroy(&file_actions);
+  posix_spawn_file_actions_destroy(&file_actions);
-  (void)posix_spawnattr_destroy(&attr);
+  posix_spawnattr_destroy(&attr);
   return pid;
 
 errout_with_actions:
-  (void)posix_spawn_file_actions_destroy(&file_actions);
+  posix_spawn_file_actions_destroy(&file_actions);
 
 errout_with_attrs:
-  (void)posix_spawnattr_destroy(&attr);
+  posix_spawnattr_destroy(&attr);
 
 errout_with_errno:
   set_errno(ret);

examples/ajoystick/ajoy_main.c

@@ -203,8 +203,8 @@ static int ajoy_wait(int fd, FAR const struct timespec *timeout)
 
   /* Wait for a signal */
 
-  (void)sigemptyset(&set);
+  sigemptyset(&set);
-  (void)sigaddset(&set, CONFIG_EXAMPLES_AJOYSTICK_SIGNO);
+  sigaddset(&set, CONFIG_EXAMPLES_AJOYSTICK_SIGNO);
   ret = sigtimedwait(&set, &value, timeout);
   if (ret < 0)
     {

examples/alarm/alarm_main.c

@@ -93,8 +93,8 @@ static int alarm_daemon(int argc, FAR char *argv[])
 
   /* Make sure that the alarm signal is unmasked */
 
-  (void)sigemptyset(&set);
+  sigemptyset(&set);
-  (void)sigaddset(&set, CONFIG_EXAMPLES_ALARM_SIGNO);
+  sigaddset(&set, CONFIG_EXAMPLES_ALARM_SIGNO);
   ret = sigprocmask(SIG_UNBLOCK, &set, NULL);
   if (ret != OK)
     {
@@ -109,8 +109,8 @@ static int alarm_daemon(int argc, FAR char *argv[])
   act.sa_sigaction = alarm_handler;
   act.sa_flags     = SA_SIGINFO;
 
-  (void)sigfillset(&act.sa_mask);
+  sigfillset(&act.sa_mask);
-  (void)sigdelset(&act.sa_mask, CONFIG_EXAMPLES_ALARM_SIGNO);
+  sigdelset(&act.sa_mask, CONFIG_EXAMPLES_ALARM_SIGNO);
 
   ret = sigaction(CONFIG_EXAMPLES_ALARM_SIGNO, &act, NULL);
   if (ret < 0)
@@ -325,7 +325,7 @@ int main(int argc, FAR char *argv[])
           fprintf(stderr, "ERROR: RTC_RD_ALARM ioctl failed: %d\n",
                   errcode);
 
-          (void)close(fd);
+          close(fd);
           return EXIT_FAILURE;
         }
 
@@ -380,7 +380,7 @@ int main(int argc, FAR char *argv[])
           fprintf(stderr, "ERROR: RTC_CANCEL_ALARM ioctl failed: %d\n",
                   errcode);
 
-          (void)close(fd);
+          close(fd);
           return EXIT_FAILURE;
         }
 
@@ -409,13 +409,13 @@ int main(int argc, FAR char *argv[])
           fprintf(stderr, "ERROR: RTC_SET_RELATIVE ioctl failed: %d\n",
                   errcode);
 
-          (void)close(fd);
+          close(fd);
           return EXIT_FAILURE;
         }
 
       printf("Alarm %d set in %lu seconds\n", alarmid, seconds);
     }
 
-  (void)close(fd);
+  close(fd);
   return EXIT_SUCCESS;
 }

examples/buttons/buttons_main.c

@@ -249,8 +249,8 @@ static int button_daemon(int argc, char *argv[])
 #ifdef CONFIG_EXAMPLES_BUTTONS_SIGNAL
       /* Wait for a signal */
 
-      (void)sigemptyset(&set);
+      sigemptyset(&set);
-      (void)sigaddset(&set, CONFIG_EXAMPLES_BUTTONS_SIGNO);
+      sigaddset(&set, CONFIG_EXAMPLES_BUTTONS_SIGNO);
       ret = sigwaitinfo(&set, &value);
       if (ret < 0)
         {
@@ -366,7 +366,7 @@ static int button_daemon(int argc, char *argv[])
     }
 
 errout_with_fd:
-  (void)close(fd);
+  close(fd);
 
 errout:
   g_button_daemon_started = false;

examples/calib_udelay/calib_udelay_main.c

@@ -78,7 +78,7 @@ static uint64_t gettime_nsecs(void)
   struct timespec ts;
   uint64_t nsecs;
 
-  (void)clock_gettime(CLOCK_MONOTONIC, &ts);
+  clock_gettime(CLOCK_MONOTONIC, &ts);
 
   nsecs  = ts.tv_sec;
   nsecs *= 1000 * 1000 * 1000;

examples/canard/canard_main.c

@@ -233,8 +233,8 @@ static void onTransferReceived(CanardInstance *ins,
                                (uint16_t) total_size);
       if (resp_res <= 0)
         {
-          (void)fprintf(stderr, "Could not respond to GetNodeInfo; error %d\n",
+          fprintf(stderr, "Could not respond to GetNodeInfo; error %d\n",
-                        resp_res);
+                  resp_res);
         }
     }
 }
@@ -257,8 +257,6 @@ static bool shouldAcceptTransfer(const CanardInstance * ins,
                                  CanardTransferType transfer_type,
                                  uint8_t source_node_id)
 {
-  (void)source_node_id;
-
   if (canardGetLocalNodeID(ins) == CANARD_BROADCAST_NODE_ID)
     {
       /* If we're in the process of allocation of dynamic node ID, accept
@@ -335,8 +333,8 @@ void process1HzTasks(uint64_t timestamp_usec)
                       buffer, UAVCAN_NODE_STATUS_MESSAGE_SIZE);
     if (bc_res <= 0)
       {
-        (void)fprintf(stderr, "Could not broadcast node status; error %d\n",
+        fprintf(stderr, "Could not broadcast node status; error %d\n",
-                      bc_res);
+                bc_res);
       }
   }
 
@@ -352,8 +350,8 @@ void process1HzTasks(uint64_t timestamp_usec)
                              payload, 0);
     if (resp_res <= 0)
       {
-        (void)fprintf(stderr, "Could not request GetNodeInfo; error %d\n",
+        fprintf(stderr, "Could not request GetNodeInfo; error %d\n",
-                      resp_res);
+                resp_res);
       }
   }
 
@@ -380,9 +378,9 @@ void processTxRxOnce(CanardNuttXInstance * nuttxcan, int timeout_msec)
       if (tx_res < 0)           /* Failure - drop the frame and report */
         {
           canardPopTxQueue(&canard);
-          (void)fprintf(stderr,
+          fprintf(stderr,
-                        "Transmit error %d, frame dropped, errno '%s'\n",
+                  "Transmit error %d, frame dropped, errno '%s'\n",
-                        tx_res, strerror(errno));
+                  tx_res, strerror(errno));
         }
       else if (tx_res > 0)      /* Success - just drop the frame */
         {
@@ -402,8 +400,8 @@ void processTxRxOnce(CanardNuttXInstance * nuttxcan, int timeout_msec)
 
   if (rx_res < 0)               /* Failure - report */
     {
-      (void)fprintf(stderr, "Receive error %d, errno '%s'\n", rx_res,
+      fprintf(stderr, "Receive error %d, errno '%s'\n", rx_res,
-                    strerror(errno));
+              strerror(errno));
     }
   else if (rx_res > 0)          /* Success - process the frame */
     {

examples/chrono/chrono_main.c

@@ -186,8 +186,8 @@ static int button_daemon(int argc, char *argv[])
 
       /* Wait for a signal */
 
-      (void)sigemptyset(&set);
+      sigemptyset(&set);
-      (void)sigaddset(&set, BUTTON_SIGNO);
+      sigaddset(&set, BUTTON_SIGNO);
       ret = sigwaitinfo(&set, &value);
       if (ret < 0)
         {
@@ -198,7 +198,7 @@ static int button_daemon(int argc, char *argv[])
 
       if (priv->state == CHRONO_STOPPED)
         {
-          (void)clock_gettime(CLOCK_MONOTONIC, &priv->ts_start);
+          clock_gettime(CLOCK_MONOTONIC, &priv->ts_start);
           priv->state = CHRONO_RUNNING;
         }
       else
@@ -214,7 +214,7 @@ static int button_daemon(int argc, char *argv[])
     }
 
 errout_with_fd:
-  (void)close(fd);
+  close(fd);
 
 errout:
 
@@ -284,7 +284,7 @@ static void slcd_putc(FAR struct lib_outstream_s *stream, int ch)
 
   if (stream->nput >= CONFIG_EXAMPLES_SLCD_BUFSIZE)
     {
-      (void)slcd_flush(stream);
+      slcd_flush(stream);
     }
 }
 
@@ -427,7 +427,7 @@ int main(int argc, FAR char *argv[])
         {
           /* Get the current time */
 
-          (void)clock_gettime(CLOCK_MONOTONIC, &priv->ts_end);
+          clock_gettime(CLOCK_MONOTONIC, &priv->ts_end);
 
           /* How many seconds passed from initial time? */
 

examples/configdata/configdata_main.c

@@ -179,7 +179,7 @@ static void configdata_loopmemusage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   g_mmafter = mallinfo();
 #else
-  (void)mallinfo(&g_mmafter);
+  mallinfo(&g_mmafter);
 #endif
 
   /* Show the change from the previous loop */
@@ -206,7 +206,7 @@ static void configdata_endmemusage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   g_mmafter = mallinfo();
 #else
-  (void)mallinfo(&g_mmafter);
+  mallinfo(&g_mmafter);
 #endif
   printf("\nFinal memory usage:\n");
   configdata_showmemusage(&g_mmbefore, &g_mmafter);
@@ -682,7 +682,7 @@ int main(int argc, FAR char *argv[])
 #ifdef CONFIG_CAN_PASS_STRUCTS
   g_mmbefore = mallinfo();
 #else
-  (void)mallinfo(&g_mmbefore);
+  mallinfo(&g_mmbefore);
 #endif
 
   /* Loop seveal times ... create some config data items, delete them
@@ -706,7 +706,7 @@ int main(int argc, FAR char *argv[])
 #ifndef CONFIG_EXAMPLES_CONFIGDATA_SILENT
       printf("\n=== FILLING %u =============================\n", i);
 #endif
-      (void)configdata_fillconfig();
+      configdata_fillconfig();
 #ifndef CONFIG_EXAMPLES_CONFIGDATA_SILENT
       printf("Filled /dev/config\n");
       printf("  Number of entries: %d\n", g_nentries);

examples/discover/discover_main.c

@@ -153,7 +153,7 @@ int main(int argc, FAR char *argv[])
   if (handle)
     {
       struct dhcpc_state ds;
-      (void)dhcpc_request(handle, &ds);
+      dhcpc_request(handle, &ds);
       netlib_set_ipv4addr("eth0", &ds.ipaddr);
 
       if (ds.netmask.s_addr != 0)

examples/djoystick/djoy_main.c

@@ -201,8 +201,8 @@ int main(int argc, FAR char *argv[])
 
       /* Wait for a signal */
 
-      (void)sigemptyset(&set);
+      sigemptyset(&set);
-      (void)sigaddset(&set, CONFIG_EXAMPLES_DJOYSTICK_SIGNO);
+      sigaddset(&set, CONFIG_EXAMPLES_DJOYSTICK_SIGNO);
       ret = sigwaitinfo(&set, &value);
       if (ret < 0)
         {

examples/elf/elf_main.c

@@ -182,7 +182,7 @@ static void mm_update(FAR unsigned int *previous, FAR const char *msg)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -207,7 +207,7 @@ static void mm_initmonitor(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   g_mminitial = mmcurrent.uordblks;
@@ -362,7 +362,7 @@ int main(int argc, FAR char *argv[])
    * the ROMFS mountpoint.
    */
 
-  (void)setenv("PATH", MOUNTPT, 1);
+  setenv("PATH", MOUNTPT, 1);
 #endif
 
   /* Now exercise every program in the ROMFS file system */

examples/elf/tests/signal/signal.c

@@ -139,7 +139,7 @@ int main(int argc, char **argv)
   act.sa_sigaction = siguser_action;
   act.sa_flags     = SA_SIGINFO;
 
-  (void)sigemptyset(&act.sa_mask);
+  sigemptyset(&act.sa_mask);
 
   status = sigaction(SIGUSR1, &act, &oact1);
   if (status != 0)

examples/flash_test/flash_test.c

@@ -107,8 +107,8 @@ int main(int argc, FAR char *argv[])
     {
       /* Perform a low-level format */
 
-      (void)inode->u.i_bops->ioctl(inode, BIOC_LLFORMAT, 0);
+      inode->u.i_bops->ioctl(inode, BIOC_LLFORMAT, 0);
-      (void)inode->u.i_bops->ioctl(inode, BIOC_GETFORMAT, (unsigned long) &fmt);
+      inode->u.i_bops->ioctl(inode, BIOC_GETFORMAT, (unsigned long) &fmt);
     }
 
   if (!(fmt.flags & SMART_FMT_ISFORMATTED))
@@ -137,7 +137,7 @@ int main(int argc, FAR char *argv[])
   seqs = (uint16_t *) malloc(fmt.nsectors << 1);
   if (seqs == NULL)
     {
-      (void) free(buffer);
+      free(buffer);
       fprintf(stderr, "Error allocating seqs buffer\n");
       goto errout_with_driver;
     }
@@ -145,8 +145,8 @@ int main(int argc, FAR char *argv[])
   sectors = (uint16_t *) malloc(fmt.nsectors << 1);
   if (sectors == NULL)
     {
-      (void) free(seqs);
+      free(seqs);
-      (void) free(buffer);
+      free(buffer);
       fprintf(stderr, "Error allocating sectors buffer\n");
       goto errout_with_driver;
     }
@@ -182,8 +182,8 @@ int main(int argc, FAR char *argv[])
       readwrite.offset = 0;
       readwrite.count = strlen(buffer) + 1;
       readwrite.buffer = (uint8_t *) buffer;
-      (void)inode->u.i_bops->ioctl(inode, BIOC_WRITESECT, (unsigned long)
+      inode->u.i_bops->ioctl(inode, BIOC_WRITESECT, (unsigned long)
-                                   &readwrite);
+                             &readwrite);
 
       /* Print the logical sector number */
 
@@ -241,8 +241,8 @@ int main(int argc, FAR char *argv[])
       readwrite.offset = 0;
       readwrite.count = strlen(buffer) + 1;
       readwrite.buffer = (uint8_t *) buffer;
-      (void)inode->u.i_bops->ioctl(inode, BIOC_WRITESECT, (unsigned long)
+      inode->u.i_bops->ioctl(inode, BIOC_WRITESECT, (unsigned long)
-                                   &readwrite);
+                             &readwrite);
 
       /* Print the logical sector number */
 
@@ -266,8 +266,8 @@ int main(int argc, FAR char *argv[])
       readwrite.offset = 64;
       readwrite.count = strlen(buffer) + 1;
       readwrite.buffer = (uint8_t *) buffer;
-      (void)inode->u.i_bops->ioctl(inode, BIOC_WRITESECT, (unsigned long)
+      inode->u.i_bops->ioctl(inode, BIOC_WRITESECT, (unsigned long)
-                                   &readwrite);
+                             &readwrite);
 
       /* Print the logical sector number */
 
@@ -284,22 +284,22 @@ int main(int argc, FAR char *argv[])
 
       if (sectors[x] != 0xFFFF)
         {
-          (void)inode->u.i_bops->ioctl(inode, BIOC_FREESECT, (unsigned long)
+          inode->u.i_bops->ioctl(inode, BIOC_FREESECT, (unsigned long)
-                                       sectors[x]);
+                                 sectors[x]);
         }
     }
 
 errout_with_buffers:
   /* Free the allocated buffers */
 
-  (void) free(seqs);
+  free(seqs);
-  (void) free(sectors);
+  free(sectors);
-  (void) free(buffer);
+  free(buffer);
 
 errout_with_driver:
   /* Now close the block device and exit */
 
-  (void)close_blockdriver(inode);
+  close_blockdriver(inode);
 
 errout:
 

examples/ft80x/ft80x_main.c

@@ -183,7 +183,7 @@ static int ft80x_showname(int fd, FAR struct ft80x_dlbuffer_s *buffer,
 
   /* Mkae sure that the backlight off */
 
-  (void)ft80x_backlight_set(fd, 0);
+  ft80x_backlight_set(fd, 0);
 
   /* Create the display list */
 
@@ -235,8 +235,8 @@ static int ft80x_showname(int fd, FAR struct ft80x_dlbuffer_s *buffer,
 
   /* Fade on then wait bit so that the user can read the example name */
 
-  (void)ft80x_backlight_fade(fd, 100, 2000);
+  ft80x_backlight_fade(fd, 100, 2000);
-  (void)sleep(1);
+  sleep(1);
   return OK;
 }
 
@@ -276,7 +276,7 @@ static int ft80x_example(int fd, FAR struct ft80x_dlbuffer_s *buffer,
   /* Wait a bit, then fade out */
 
   sleep(2);
-  (void)ft80x_backlight_fade(fd, 0, 2000);
+  ft80x_backlight_fade(fd, 0, 2000);
   return OK;
 }
 
@@ -325,7 +325,7 @@ int main(int argc, FAR char *argv[])
 
   for (i = 0; i < NPRIMITIVES; i++)
     {
-      (void)ft80x_example(fd, buffer, &g_primitives[i]);
+      ft80x_example(fd, buffer, &g_primitives[i]);
     }
 #endif
 
@@ -335,7 +335,7 @@ int main(int argc, FAR char *argv[])
 
   for (i = 0; i < NCOPROC; i++)
     {
-      (void)ft80x_example(fd, buffer, &g_coproc[i]);
+      ft80x_example(fd, buffer, &g_coproc[i]);
     }
 
   free(buffer);

examples/ft80x/ft80x_primitives.c

@@ -735,7 +735,7 @@ int ft80x_prim_stencil(int fd, FAR struct ft80x_dlbuffer_s *buffer)
     }
 
 errout_with_sound:
-  (void)ft80x_audio_enable(fd, false);
+  ft80x_audio_enable(fd, false);
   return ret;
 }
 

examples/ftpc/ftpc_main.c

@@ -488,7 +488,7 @@ int main(int argc, FAR char *argv[])
         {
           /* Parse and process the command */
 
-          (void)ftpc_parse(handle, g_line);
+          ftpc_parse(handle, g_line);
           FFLUSH();
         }
     }

examples/ftpd/ftpd_main.c

@@ -196,7 +196,7 @@ int ftpd_daemon(int s_argc, char **s_argv)
 
   /* Configure acounts */
 
-  (void)ftpd_accounts(handle);
+  ftpd_accounts(handle);
 
   /* Then drive the FTPD server. */
 

examples/gpio/gpio_main.c

@@ -268,14 +268,14 @@ int main(int argc, FAR char *argv[])
 
               /* Wait up to 5 seconds for the signal */
 
-              (void)sigemptyset(&set);
+              sigemptyset(&set);
-              (void)sigaddset(&set, signo);
+              sigaddset(&set, signo);
 
               ts.tv_sec  = 5;
               ts.tv_nsec = 0;
 
               ret = sigtimedwait(&set, NULL, &ts);
-              (void)ioctl(fd, GPIOC_UNREGISTER, 0);
+              ioctl(fd, GPIOC_UNREGISTER, 0);
 
               if (ret < 0)
                 {

examples/hidkbd/hidkbd_main.c

@@ -242,7 +242,7 @@ int main(int argc, FAR char *argv[])
 #ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
               hidkbd_decode(buffer, nbytes);
 #else
-              (void)write(1, buffer, nbytes);
+              write(1, buffer, nbytes);
 #endif
             }
         }

examples/i2schar/i2schar_main.c

@@ -293,14 +293,14 @@ int main(int argc, FAR char *argv[])
    * is in place for each transmission.
     */
 
-  (void)pthread_attr_getschedparam(&attr, &param);
+  pthread_attr_getschedparam(&attr, &param);
   param.sched_priority++;
-  (void)pthread_attr_setschedparam(&attr, &param);
+  pthread_attr_setschedparam(&attr, &param);
 #endif
 
   /* Set the receiver stack size */
 
-  (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_I2SCHAR_RXSTACKSIZE);
+  pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_I2SCHAR_RXSTACKSIZE);
 
   /* Start the receiver */
 
@@ -323,7 +323,7 @@ int main(int argc, FAR char *argv[])
 
   /* Set the transmitter stack size */
 
-  (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_I2SCHAR_TXSTACKSIZE);
+  pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_I2SCHAR_TXSTACKSIZE);
 
   /* Start the transmitter */
 
@@ -334,7 +334,7 @@ int main(int argc, FAR char *argv[])
       printf("i2schar_main: ERROR: failed to Start transmitter thread: %d\n", ret);
 #ifdef CONFIG_EXAMPLES_I2SCHAR_RX
       printf("i2schar_main: Waiting for the receiver thread\n");
-      (void)pthread_join(receiver, &result);
+      pthread_join(receiver, &result);
 #endif
       return EXIT_FAILURE;
     }

examples/leds/leds_main.c

@@ -174,7 +174,7 @@ static int led_daemon(int argc, char *argv[])
     }
 
 errout_with_fd:
-  (void)close(fd);
+  close(fd);
 
 errout:
   g_led_daemon_started = false;

examples/lvgldemo/demo.c

@@ -177,8 +177,6 @@ static lv_res_t keyboard_open_close(lv_obj_t *text_area)
 {
   lv_obj_t *parent;
 
-  (void)text_area; /* Unused */
-
   /* Text area is on the scrollable part of the page but we need
    * the page itself
    */
@@ -235,8 +233,6 @@ static lv_res_t keyboard_open_close(lv_obj_t *text_area)
 
 static lv_res_t keyboard_hide_action(lv_obj_t *keyboard)
 {
-  (void)keyboard; /* Unused */
-
 #if USE_LV_ANIMATION
   lv_obj_animate(kb, LV_ANIM_FLOAT_BOTTOM | LV_ANIM_OUT, 300, 0,
                  kb_hide_anim_end);

examples/lvgldemo/lvgldemo.c

@@ -151,12 +151,12 @@ int main(int argc, FAR char *argv[])
 #ifdef NEED_BOARDINIT
   /* Perform board-specific driver initialization */
 
-  (void)boardctl(BOARDIOC_INIT, 0);
+  boardctl(BOARDIOC_INIT, 0);
 
 #ifdef CONFIG_BOARDCTL_FINALINIT
   /* Perform architecture-specific final-initialization (if configured) */
 
-  (void)boardctl(BOARDIOC_FINALINIT, 0);
+  boardctl(BOARDIOC_FINALINIT, 0);
 #endif
 #endif
 

examples/mld/mld_main.c

@@ -181,7 +181,7 @@ void mld_catfile(FAR const char *filepath, FAR char **iobuffer)
       *iobuffer = (FAR char *)malloc(IOBUFFERSIZE);
       if (*iobuffer == NULL)
         {
-          (void)close(fd);
+          close(fd);
           fprintf(stderr, "Failed to allocation I/O buffer\n");
           return;
         }
@@ -244,7 +244,7 @@ void mld_catfile(FAR const char *filepath, FAR char **iobuffer)
         }
     }
 
-  (void)close(fd);
+  close(fd);
 }
 #endif
 

examples/modbus/modbus_main.c

@@ -232,13 +232,13 @@ static inline int modbus_initialize(void)
 errout_with_modbus:
   /* Release hardware resources. */
 
-  (void)eMBClose();
+  eMBClose();
 
 errout_with_mutex:
 
   /* Free/uninitialize data structures */
 
-  (void)pthread_mutex_destroy(&g_modbus.lock);
+  pthread_mutex_destroy(&g_modbus.lock);
 
   g_modbus.threadstate = STOPPED;
   return status;
@@ -289,15 +289,15 @@ static void *modbus_pollthread(void *pvarg)
 
   /* Disable */
 
-  (void)eMBDisable();
+  eMBDisable();
 
   /* Release hardware resources. */
 
-  (void)eMBClose();
+  eMBClose();
 
   /* Free/uninitialize data structures */
 
-  (void)pthread_mutex_destroy(&g_modbus.lock);
+  pthread_mutex_destroy(&g_modbus.lock);
   g_modbus.threadstate = STOPPED;
   return NULL;
 }
@@ -373,9 +373,9 @@ int main(int argc, FAR char *argv[])
       switch (option)
         {
           case 'd': /* Disable protocol stack */
-            (void)pthread_mutex_lock(&g_modbus.lock);
+            pthread_mutex_lock(&g_modbus.lock);
             g_modbus.threadstate = SHUTDOWN;
-            (void)pthread_mutex_unlock(&g_modbus.lock);
+            pthread_mutex_unlock(&g_modbus.lock);
             break;
 
           case 'e': /* Enable the protocol stack */

examples/modbusmaster/mbmaster_main.c

@@ -169,11 +169,11 @@ static inline void mbmaster_deinitialize(void)
 {
   /* Disable modbus stack */
 
-  (void)eMBMasterDisable();
+  eMBMasterDisable();
 
   /* Release hardware resources */
 
-  (void)eMBMasterClose();
+  eMBMasterClose();
 }
 
 /****************************************************************************

examples/netlink_route/netlink_route_main.c

@@ -155,7 +155,7 @@ static void dump_neighbor(void)
     {
       FAR struct neighbor_entry_s *nb = &nbtab[i];
 
-      (void)inet_ntop(AF_INET6, &nb->ne_ipaddr, buffer, INET6_ADDRSTRLEN);
+      inet_ntop(AF_INET6, &nb->ne_ipaddr, buffer, INET6_ADDRSTRLEN);
       printf("  Dest: %s MAC Type: %2u Size: %3u Addr: ",
              buffer, nb->ne_addr.na_lltype, nb->ne_addr.na_llsize);
 
@@ -234,7 +234,7 @@ static void dump_arp(void)
     {
       FAR struct arp_entry_s *arp = &arptab[i];
 
-      (void)inet_ntop(AF_INET, &arp->at_ipaddr, buffer, INET_ADDRSTRLEN);
+      inet_ntop(AF_INET, &arp->at_ipaddr, buffer, INET_ADDRSTRLEN);
       printf("  Dest: %s MAC Addr: ", buffer);
 
       for (j = 0; j < ETHER_ADDR_LEN; j++)
@@ -301,16 +301,16 @@ static void dump_route(sa_family_t family)
     {
       FAR struct rtentry *rte = &rttab[i];
 
-      (void)inet_ntop(rte->rt_dst.ss_family, &rte->rt_dst.ss_data, buffer,
+      inet_ntop(rte->rt_dst.ss_family, &rte->rt_dst.ss_data, buffer,
-                      ROUTE_BUFSIZE);
+                ROUTE_BUFSIZE);
       printf("  Dest: %s ", buffer);
 
-      (void)inet_ntop(rte->rt_gateway.ss_family, &rte->rt_gateway.ss_data,
+      inet_ntop(rte->rt_gateway.ss_family, &rte->rt_gateway.ss_data,
-                      buffer, ROUTE_BUFSIZE);
+                buffer, ROUTE_BUFSIZE);
       printf("Gateway: %s ", buffer);
 
-      (void)inet_ntop(rte->rt_genmask.ss_family, &rte->rt_genmask.ss_data,
+      inet_ntop(rte->rt_genmask.ss_family, &rte->rt_genmask.ss_data,
-                      buffer, ROUTE_BUFSIZE);
+                buffer, ROUTE_BUFSIZE);
       printf("GenMASK: %s ", buffer);
       printf("Flags: %04x\n", rte->rt_flags);
     }

examples/netloop/lo_listener.c

@@ -367,7 +367,7 @@ void *lo_listener(pthread_addr_t pvarg)
               nsds--;
               if (i == nls.listensd)
                 {
-                  (void)net_connection(&nls);
+                  net_connection(&nls);
                 }
               else
                 {

examples/nettest/nettest_target1.c

@@ -117,7 +117,7 @@ int main(int argc, FAR char *argv[])
 
 #if defined(CONFIG_EXAMPLES_NETTEST_LOOPBACK) && defined(CONFIG_SCHED_WAITPID)
   printf("main: Waiting for the server to exit\n");
-  (void)waitpid(child, &statloc, 0);
+  waitpid(child, &statloc, 0);
 #endif
 
   return EXIT_SUCCESS;

examples/nx/nx_main.c

@@ -143,7 +143,7 @@ static void nxeg_drivemouse(void)
       for (y = 0; y < g_yres; y += ystep)
         {
           printf("nxeg_drivemouse: Mouse left button at (%d,%d)\n", x, y);
-          (void)nx_mousein(g_hnx, x, y, NX_MOUSE_LEFTBUTTON);
+          nx_mousein(g_hnx, x, y, NX_MOUSE_LEFTBUTTON);
         }
     }
 }
@@ -475,10 +475,10 @@ static int nxeg_initialize(void)
         * smoothly.
         */
 
-       (void)pthread_attr_init(&attr);
+       pthread_attr_init(&attr);
        param.sched_priority = CONFIG_EXAMPLES_NX_LISTENERPRIO;
-       (void)pthread_attr_setschedparam(&attr, &param);
+       pthread_attr_setschedparam(&attr, &param);
-       (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NX_STACKSIZE);
+       pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NX_STACKSIZE);
 
        ret = pthread_create(&thread, &attr, nx_listenerthread, NULL);
        if (ret != 0)
@@ -496,7 +496,7 @@ static int nxeg_initialize(void)
             * are connected.
             */
 
-           (void)sem_wait(&g_semevent);
+           sem_wait(&g_semevent);
          }
     }
   else
@@ -574,7 +574,7 @@ int main(int argc, FAR char *argv[])
 
   while (!b_haveresolution)
     {
-      (void)sem_wait(&g_semevent);
+      sem_wait(&g_semevent);
     }
   printf("nx_main: Screen resolution (%d,%d)\n", g_xres, g_yres);
 
@@ -775,13 +775,13 @@ int main(int argc, FAR char *argv[])
 
 errout_with_hwnd2:
   printf("nx_main: Close window #2\n");
-  (void)nxeg_closewindow(hwnd2, &g_wstate[1]);
+  nxeg_closewindow(hwnd2, &g_wstate[1]);
 
   /* Close the window1 */
 
 errout_with_hwnd1:
   printf("nx_main: Close window #1\n");
-  (void)nxeg_closewindow(hwnd1, &g_wstate[0]);
+  nxeg_closewindow(hwnd1, &g_wstate[0]);
 
 errout_with_nx:
   /* Disconnect from the server */

examples/nxdemo/nxdemo_main.c

@@ -164,10 +164,10 @@ static inline int nxdemo_initialize(void)
         * smoothly.
         */
 
-       (void)pthread_attr_init(&attr);
+       pthread_attr_init(&attr);
        param.sched_priority = CONFIG_EXAMPLES_NXDEMO_LISTENERPRIO;
-       (void)pthread_attr_setschedparam(&attr, &param);
+       pthread_attr_setschedparam(&attr, &param);
-       (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXDEMO_LISTENER_STACKSIZE);
+       pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXDEMO_LISTENER_STACKSIZE);
 
        ret = pthread_create(&thread, &attr, nxdemo_listener, NULL);
        if (ret != 0)
@@ -184,7 +184,7 @@ static inline int nxdemo_initialize(void)
             * are connected.
             */
 
-           (void)sem_wait(&g_nxdemo.eventsem);
+           sem_wait(&g_nxdemo.eventsem);
          }
     }
   else
@@ -237,7 +237,7 @@ int main(int argc, FAR char *argv[])
 
   while (!g_nxdemo.havepos)
     {
-      (void)sem_wait(&g_nxdemo.eventsem);
+      sem_wait(&g_nxdemo.eventsem);
     }
 
   printf("nxdemo_main: Screen resolution (%d,%d)\n",
@@ -247,7 +247,7 @@ int main(int argc, FAR char *argv[])
 
   /* Release background */
 
-  (void)nx_releasebkgd(g_nxdemo.hbkgd);
+  nx_releasebkgd(g_nxdemo.hbkgd);
 
   /* Close NX */
 

examples/nxflat/nxflat_main.c

@@ -187,7 +187,7 @@ int main(int argc, FAR char *argv[])
    * the ROMFS mountpoint.
    */
 
-  (void)setenv("PATH", MOUNTPT, 1);
+  setenv("PATH", MOUNTPT, 1);
 #endif
 
   /* Now excercise every progrm in the ROMFS file system */

examples/nxflat/tests/signal/signal.c

@@ -139,7 +139,7 @@ int main(int argc, char **argv)
   act.sa_sigaction = siguser_action;
   act.sa_flags     = SA_SIGINFO;
 
-  (void)sigemptyset(&act.sa_mask);
+  sigemptyset(&act.sa_mask);
 
   status = sigaction(SIGUSR1, &act, &oact1);
   if (status != 0)

examples/nxhello/nxhello_bkgd.c

@@ -402,8 +402,8 @@ void nxhello_hello(NXWINDOW hwnd)
 #if CONFIG_NX_NPLANES > 1
 # warning "More logic is needed for the case where CONFIG_NX_PLANES > 1"
 #endif
-          (void)RENDERER((FAR nxgl_mxpixel_t*)glyph, fheight, fwidth,
+          RENDERER((FAR nxgl_mxpixel_t*)glyph, fheight, fwidth,
-                         fstride, fbm, CONFIG_EXAMPLES_NXHELLO_FONTCOLOR);
+                   fstride, fbm, CONFIG_EXAMPLES_NXHELLO_FONTCOLOR);
 
           /* Describe the destination of the font with a rectangle */
 

examples/nxhello/nxhello_main.c

@@ -141,10 +141,10 @@ static inline int nxhello_initialize(void)
         * smoothly.
         */
 
-       (void)pthread_attr_init(&attr);
+       pthread_attr_init(&attr);
        param.sched_priority = CONFIG_EXAMPLES_NXHELLO_LISTENERPRIO;
-       (void)pthread_attr_setschedparam(&attr, &param);
+       pthread_attr_setschedparam(&attr, &param);
-       (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXHELLO_LISTENER_STACKSIZE);
+       pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXHELLO_LISTENER_STACKSIZE);
 
        ret = pthread_create(&thread, &attr, nxhello_listener, NULL);
        if (ret != 0)
@@ -161,7 +161,7 @@ static inline int nxhello_initialize(void)
             * are connected.
             */
 
-           (void)sem_wait(&g_nxhello.eventsem);
+           sem_wait(&g_nxhello.eventsem);
          }
     }
   else
@@ -235,7 +235,7 @@ int main(int argc, FAR char *argv[])
 
   while (!g_nxhello.havepos)
     {
-      (void)sem_wait(&g_nxhello.eventsem);
+      sem_wait(&g_nxhello.eventsem);
     }
 
   printf("nxhello_main: Screen resolution (%d,%d)\n", g_nxhello.xres, g_nxhello.yres);
@@ -248,7 +248,7 @@ int main(int argc, FAR char *argv[])
 
   /* Release background */
 
-  (void)nx_releasebkgd(g_nxhello.hbkgd);
+  nx_releasebkgd(g_nxhello.hbkgd);
 
   /* Close NX */
 

examples/nximage/nximage_main.c

@@ -145,10 +145,10 @@ static inline int nximage_initialize(void)
         * smoothly.
         */
 
-       (void)pthread_attr_init(&attr);
+       pthread_attr_init(&attr);
        param.sched_priority = CONFIG_EXAMPLES_NXIMAGE_LISTENERPRIO;
-       (void)pthread_attr_setschedparam(&attr, &param);
+       pthread_attr_setschedparam(&attr, &param);
-       (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXIMAGE_LISTENER_STACKSIZE);
+       pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXIMAGE_LISTENER_STACKSIZE);
 
        ret = pthread_create(&thread, &attr, nximage_listener, NULL);
        if (ret != 0)
@@ -165,7 +165,7 @@ static inline int nximage_initialize(void)
             * are connected.
             */
 
-           (void)sem_wait(&g_nximage.eventsem);
+           sem_wait(&g_nximage.eventsem);
          }
     }
   else
@@ -232,7 +232,7 @@ int main(int argc, FAR char *argv[])
 
   while (!g_nximage.havepos)
     {
-      (void)sem_wait(&g_nximage.eventsem);
+      sem_wait(&g_nximage.eventsem);
     }
 
   printf("nximage_main: Screen resolution (%d,%d)\n", g_nximage.xres, g_nximage.yres);
@@ -244,7 +244,7 @@ int main(int argc, FAR char *argv[])
 
   /* Release background */
 
-  (void)nx_releasebkgd(g_nximage.hbkgd);
+  nx_releasebkgd(g_nximage.hbkgd);
 
   /* Close NX */
 

examples/nxlines/nxlines_main.c

@@ -167,10 +167,10 @@ static inline int nxlines_initialize(void)
         * smoothly.
         */
 
-       (void)pthread_attr_init(&attr);
+       pthread_attr_init(&attr);
        param.sched_priority = CONFIG_EXAMPLES_NXLINES_LISTENERPRIO;
-       (void)pthread_attr_setschedparam(&attr, &param);
+       pthread_attr_setschedparam(&attr, &param);
-       (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXLINES_LISTENER_STACKSIZE);
+       pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXLINES_LISTENER_STACKSIZE);
 
        ret = pthread_create(&thread, &attr, nxlines_listener, NULL);
        if (ret != 0)
@@ -187,7 +187,7 @@ static inline int nxlines_initialize(void)
             * are connected.
             */
 
-           (void)sem_wait(&g_nxlines.eventsem);
+           sem_wait(&g_nxlines.eventsem);
          }
     }
   else
@@ -251,7 +251,7 @@ int main(int argc, FAR char *argv[])
 
   while (!g_nxlines.havepos)
     {
-      (void)sem_wait(&g_nxlines.eventsem);
+      sem_wait(&g_nxlines.eventsem);
     }
 
   printf("nxlines_main: Screen resolution (%d,%d)\n", g_nxlines.xres, g_nxlines.yres);
@@ -264,7 +264,7 @@ int main(int argc, FAR char *argv[])
 
   /* Release background */
 
-  (void)nx_releasebkgd(g_nxlines.hbkgd);
+  nx_releasebkgd(g_nxlines.hbkgd);
 
   /* Close NX */
 

examples/nxterm/nxterm_main.c

@@ -160,10 +160,10 @@ static int nxterm_initialize(void)
         * smoothly.
         */
 
-       (void)pthread_attr_init(&attr);
+       pthread_attr_init(&attr);
        param.sched_priority = CONFIG_EXAMPLES_NXTERM_LISTENERPRIO;
-       (void)pthread_attr_setschedparam(&attr, &param);
+       pthread_attr_setschedparam(&attr, &param);
-       (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXTERM_STACKSIZE);
+       pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXTERM_STACKSIZE);
 
        ret = pthread_create(&thread, &attr, nxterm_listener, NULL);
        if (ret != 0)
@@ -180,7 +180,7 @@ static int nxterm_initialize(void)
             * are connected.
             */
 
-           (void)sem_wait(&g_nxterm_vars.eventsem);
+           sem_wait(&g_nxterm_vars.eventsem);
          }
     }
   else
@@ -200,14 +200,14 @@ static int nxterm_task(int argc, char **argv)
   /* If the console front end is selected, then run it on this thread */
 
 #ifdef CONFIG_NSH_CONSOLE
-  (void)nsh_consolemain(0, NULL);
+  nsh_consolemain(0, NULL);
 #endif
 
   printf("nxterm_task: Unlinking the NX console device\n");
-  (void)unlink(CONFIG_EXAMPLES_NXTERM_DEVNAME);
+  unlink(CONFIG_EXAMPLES_NXTERM_DEVNAME);
 
   printf("nxterm_task: Close the window\n");
-  (void)nxtk_closewindow(g_nxterm_vars.hwnd);
+  nxtk_closewindow(g_nxterm_vars.hwnd);
 
   /* Disconnect from the server */
 
@@ -308,7 +308,7 @@ int main(int argc, FAR char *argv[])
 
   while (!g_nxterm_vars.haveres)
     {
-      (void)sem_wait(&g_nxterm_vars.eventsem);
+      sem_wait(&g_nxterm_vars.eventsem);
     }
 
   printf("nxterm_main: Screen resolution (%d,%d)\n",
@@ -409,14 +409,14 @@ int main(int argc, FAR char *argv[])
    printf("nxterm_main: Starting the console task\n");
    fflush(stdout);
 
-  (void)fflush(stdout);
+  fflush(stdout);
-  (void)fflush(stderr);
+  fflush(stderr);
 
-  (void)fclose(stdout);
+  fclose(stdout);
-  (void)fclose(stderr);
+  fclose(stderr);
 
-  (void)dup2(fd, 1);
+  dup2(fd, 1);
-  (void)dup2(fd, 2);
+  dup2(fd, 2);
 
    /* And we can close our original driver file descriptor */
 
@@ -435,10 +435,10 @@ int main(int argc, FAR char *argv[])
   /* Error Exits ************************************************************/
 
 errout_with_driver:
-  (void)unlink(CONFIG_EXAMPLES_NXTERM_DEVNAME);
+  unlink(CONFIG_EXAMPLES_NXTERM_DEVNAME);
 
 errout_with_hwnd:
-  (void)nxtk_closewindow(g_nxterm_vars.hwnd);
+  nxtk_closewindow(g_nxterm_vars.hwnd);
 
 errout_with_nx:
   /* Disconnect from the server */

examples/nxterm/nxterm_wndo.c

@@ -128,14 +128,14 @@ static void nxwndo_redraw(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
       iocargs.cmd = NXTERMIOC_NXTERM_REDRAW;
       iocargs.arg = (uintptr_t)&redraw;
 
-      (void)boardctl(BOARDIOC_NXTERM_IOCTL, (uintptr_t)&iocargs);
+      boardctl(BOARDIOC_NXTERM_IOCTL, (uintptr_t)&iocargs);
     }
   else
     {
       /* If the driver has not been opened, then just redraw the window color */
 
       wcolor[0] = CONFIG_EXAMPLES_NXTERM_WCOLOR;
-      (void)nxtk_fillwindow(hwnd, rect, wcolor);
+      nxtk_fillwindow(hwnd, rect, wcolor);
     }
 }
 
@@ -202,7 +202,7 @@ static void nxwndo_kbdin(NXWINDOW hwnd, uint8_t nch, FAR const uint8_t *ch,
                          FAR void *arg)
 {
   ginfo("hwnd=%p nch=%d\n", hwnd, nch);
-  (void)write(1, ch, nch);
+  write(1, ch, nch);
 }
 #endif
 

examples/nxtext/nxtext_main.c

@@ -222,10 +222,10 @@ static int nxtext_initialize(void)
        * smoothly.
        */
 
-      (void)pthread_attr_init(&attr);
+      pthread_attr_init(&attr);
       param.sched_priority = CONFIG_EXAMPLES_NXTEXT_LISTENERPRIO;
-      (void)pthread_attr_setschedparam(&attr, &param);
+      pthread_attr_setschedparam(&attr, &param);
-      (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXTEXT_STACKSIZE);
+      pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_NXTEXT_STACKSIZE);
 
       ret = pthread_create(&thread, &attr, nxtext_listener, NULL);
       if (ret != 0)
@@ -244,7 +244,7 @@ static int nxtext_initialize(void)
            * are connected.
            */
 
-          (void)sem_wait(&g_semevent);
+          sem_wait(&g_semevent);
         }
     }
   else
@@ -331,7 +331,7 @@ int main(int argc, FAR char *argv[])
 
   while (!b_haveresolution)
     {
-      (void)sem_wait(&g_semevent);
+      sem_wait(&g_semevent);
     }
 
   printf("nxtext_main: Screen resolution (%d,%d)\n", g_xres, g_yres);
@@ -376,7 +376,7 @@ int main(int argc, FAR char *argv[])
           /* Destroy the pop-up window and restart the sequence */
 
           printf("nxtext_main: Close pop-up\n");
-          (void)nxpu_close(hwnd);
+          nxpu_close(hwnd);
           popcnt = 0;
         }
 
@@ -400,11 +400,11 @@ errout_with_hwnd:
   if (popcnt >= 3)
     {
       printf("nxtext_main: Close pop-up\n");
-     (void)nxpu_close(hwnd);
+     nxpu_close(hwnd);
     }
 
 //errout_with_bkgd:
-  (void)nx_releasebkgd(g_bgwnd);
+  nx_releasebkgd(g_bgwnd);
 
 errout_with_nx:
   /* Disconnect from the server */

examples/nxtext/nxtext_popup.c

@@ -386,7 +386,7 @@ NXWINDOW nxpu_open(void)
   return hwnd;
 
 errout_with_hwnd:
-  (void)nx_closewindow(hwnd);
+  nx_closewindow(hwnd);
 
 errout_with_state:
   return NULL;

examples/poll/net_listener.c

@@ -413,7 +413,7 @@ void *net_listener(pthread_addr_t pvarg)
               nsds--;
               if (i == nls.listensd)
                 {
-                  (void)net_connection(&nls);
+                  net_connection(&nls);
                 }
               else
                 {

examples/poll/poll_listener.c

@@ -111,7 +111,7 @@ void *poll_listener(pthread_addr_t pvarg)
     {
       printf("poll_listener: ERROR Failed to open FIFO %s: %d\n",
              FIFO_PATH1, errno);
-      (void)close(fd);
+      close(fd);
       return (void*)-1;
     }
 
@@ -261,6 +261,6 @@ void *poll_listener(pthread_addr_t pvarg)
 
   /* Won't get here */
 
-  (void)close(fd);
+  close(fd);
   return NULL;
 }

examples/poll/select_listener.c

@@ -97,7 +97,7 @@ void *select_listener(pthread_addr_t pvarg)
     {
       printf("select_listener: ERROR Failed to open FIFO %s: %d\n",
              FIFO_PATH2, errno);
-      (void)close(fd);
+      close(fd);
       return (void*)-1;
     }
 
@@ -189,6 +189,6 @@ void *select_listener(pthread_addr_t pvarg)
 
   /* Won't get here */
 
-  (void)close(fd);
+  close(fd);
   return NULL;
 }

examples/popen/popen_main.c

@@ -88,7 +88,7 @@ int main(int argc, FAR char *argv[])
   if (stream == NULL)
     {
       fprintf(stderr, "ERROR: popen() failed: %d\n", errno);
-      (void)timer_delete(timerid);
+      timer_delete(timerid);
       return EXIT_FAILURE;
     }
 
@@ -190,6 +190,6 @@ int main(int argc, FAR char *argv[])
         }
     }
 
-  (void)timer_delete(timerid);
+  timer_delete(timerid);
   return exitcode;
 }

examples/posix_spawn/spawn_main.c

@@ -175,7 +175,7 @@ static void mm_update(FAR unsigned int *previous, FAR const char *msg)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -200,7 +200,7 @@ static void mm_initmonitor(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   g_mminitial = mmcurrent.uordblks;
@@ -272,14 +272,14 @@ int main(int argc, FAR char *argv[])
    */
 
 #if defined(CONFIG_LIB_ENVPATH) && !defined(CONFIG_PATH_INITIAL)
-  (void)setenv("PATH", MOUNTPT, 1);
+  setenv("PATH", MOUNTPT, 1);
 #endif
 
   /* Make sure that we are using our symbol tablee */
 
   symdesc.symtab   = (FAR struct symtab_s *)g_spawn_exports; /* Discard 'const' */
   symdesc.nsymbols = g_spawn_nexports;
-  (void)boardctl(BOARDIOC_APP_SYMTAB, (uintptr_t)&symdesc);
+  boardctl(BOARDIOC_APP_SYMTAB, (uintptr_t)&symdesc);
 
   /*************************************************************************
    * Case 1: Simple program with arguments

examples/powerled/powerled_main.c

@@ -465,12 +465,12 @@ int main(int argc, char *argv[])
 #ifndef CONFIG_NSH_ARCHINIT
   /* Perform architecture-specific initialization (if configured) */
 
-  (void)boardctl(BOARDIOC_INIT, 0);
+  boardctl(BOARDIOC_INIT, 0);
 
 #ifdef CONFIG_BOARDCTL_FINALINIT
   /* Perform architecture-specific final-initialization (if configured) */
 
-  (void)boardctl(BOARDIOC_FINALINIT, 0);
+  boardctl(BOARDIOC_FINALINIT, 0);
 #endif
 #endif
 

examples/pty_test/pty_test.c

@@ -349,9 +349,9 @@ int main(int argc, FAR char *argv[])
 
   /* Use this pts file as stdin, stdout, and stderr */
 
-  (void)dup2(fd_pts, 0);
+  dup2(fd_pts, 0);
-  (void)dup2(fd_pts, 1);
+  dup2(fd_pts, 1);
-  (void)dup2(fd_pts, 2);
+  dup2(fd_pts, 2);
 
   /* Create a new console using this /dev/pts/N */
 

examples/pwfb/pwfb_main.c

@@ -173,10 +173,10 @@ static bool pwfb_listener_initialize(FAR struct pwfb_state_s *st)
    * smoothly.
    */
 
-  (void)pthread_attr_init(&attr);
+  pthread_attr_init(&attr);
   param.sched_priority = CONFIG_EXAMPLES_PWFB_LISTENER_PRIO;
-  (void)pthread_attr_setschedparam(&attr, &param);
+  pthread_attr_setschedparam(&attr, &param);
-  (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_PWFB_LISTENER_STACKSIZE);
+  pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_PWFB_LISTENER_STACKSIZE);
 
   ret = pthread_create(&thread, &attr, pwfb_listener, st);
   if (ret != 0)
@@ -195,7 +195,7 @@ static bool pwfb_listener_initialize(FAR struct pwfb_state_s *st)
        * are connected.
        */
 
-      (void)sem_wait(&st->semevent);
+      sem_wait(&st->semevent);
     }
 
   return true;
@@ -650,7 +650,7 @@ int main(int argc, FAR char *argv[])
 
   while (!wstate.haveres)
     {
-      (void)sem_wait(&wstate.semevent);
+      sem_wait(&wstate.semevent);
     }
 
   printf("pwfb_main: Screen resolution (%d,%d)\n",
@@ -765,7 +765,7 @@ errout_with_cursor:
 #ifdef CONFIG_NX_SWCURSOR
   /* Disable the cursor */
 
-  (void)nxcursor_enable(wstate.hnx, false);
+  nxcursor_enable(wstate.hnx, false);
 
 errout_with_hwnds:
 #endif

examples/pwlines/pwlines_main.c

@@ -151,10 +151,10 @@ static bool pwlines_listener_initialize(FAR struct pwlines_state_s *st)
    * smoothly.
    */
 
-  (void)pthread_attr_init(&attr);
+  pthread_attr_init(&attr);
   param.sched_priority = CONFIG_EXAMPLES_PWLINES_LISTENER_PRIO;
-  (void)pthread_attr_setschedparam(&attr, &param);
+  pthread_attr_setschedparam(&attr, &param);
-  (void)pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_PWLINES_LISTENER_STACKSIZE);
+  pthread_attr_setstacksize(&attr, CONFIG_EXAMPLES_PWLINES_LISTENER_STACKSIZE);
 
   ret = pthread_create(&thread, &attr, pwlines_listener, st);
   if (ret != 0)
@@ -173,7 +173,7 @@ static bool pwlines_listener_initialize(FAR struct pwlines_state_s *st)
        * are connected.
        */
 
-      (void)sem_wait(&st->semevent);
+      sem_wait(&st->semevent);
     }
 
   return true;
@@ -384,7 +384,7 @@ int main(int argc, FAR char *argv[])
 
   while (!wstate.haveres)
     {
-      (void)sem_wait(&wstate.semevent);
+      sem_wait(&wstate.semevent);
     }
 
   printf("pwlines_main: Screen resolution (%d,%d)\n",

examples/random/random_main.c

@@ -125,7 +125,7 @@ int main(int argc, FAR char *argv[])
     {
       int errcode = errno;
       fprintf(stderr, "ERROR: Read from /dev/random failed: %d\n", errcode);
-      (void)close(fd);
+      close(fd);
       exit(EXIT_FAILURE);
     }
 
@@ -133,14 +133,14 @@ int main(int argc, FAR char *argv[])
     {
       fprintf(stderr, "ERROR: Read from /dev/random only produced %d bytes\n",
               (int)nread);
-      (void)close(fd);
+      close(fd);
       exit(EXIT_FAILURE);
     }
 
   /* Dump the sample buffer */
 
   lib_dumpbuffer("Random values", (FAR const uint8_t*)buffer, nread);
-  (void)close(fd);
+  close(fd);
   return EXIT_SUCCESS;
 }
 

examples/rgbled/rgbled.c

@@ -106,7 +106,7 @@ int main(int argc, FAR char *argv[])
       }
 
     sprintf(buffer, "#%02X%02X%02X", red, green, blue);
-    (void)write(fd, buffer, 8);
+    write(fd, buffer, 8);
     usleep(5000);
   }
 

examples/slcd/slcd_main.c

@@ -221,7 +221,7 @@ static void slcd_putc(FAR struct lib_outstream_s *stream, int ch)
 
   if (stream->nput >= CONFIG_EXAMPLES_SLCD_BUFSIZE)
     {
-      (void)slcd_flush(stream);
+      slcd_flush(stream);
     }
 }
 

examples/smps/smps_main.c

@@ -492,12 +492,12 @@ int main(int argc, char *argv[])
 #ifndef CONFIG_NSH_ARCHINIT
   /* Perform architecture-specific initialization (if configured) */
 
-  (void)boardctl(BOARDIOC_INIT, 0);
+  boardctl(BOARDIOC_INIT, 0);
 
 #ifdef CONFIG_BOARDCTL_FINALINIT
   /* Perform architecture-specific final-initialization (if configured) */
 
-  (void)boardctl(BOARDIOC_FINALINIT, 0);
+  boardctl(BOARDIOC_FINALINIT, 0);
 #endif
 #endif
 

examples/sotest/lib/modprint/modprint.c

@@ -77,7 +77,7 @@ static void modprint(FAR const char *fmt, ...)
   va_list ap;
 
   va_start(ap, fmt);
-  (void)vsyslog(LOG_INFO, fmt, ap);
+  vsyslog(LOG_INFO, fmt, ap);
   va_end(ap);
 }
 

examples/sotest/lib/sotest/sotest.c

@@ -108,7 +108,7 @@ static void modprint(FAR const char *fmt, ...)
   va_list ap;
 
   va_start(ap, fmt);
-  (void)vsyslog(LOG_INFO, fmt, ap);
+  vsyslog(LOG_INFO, fmt, ap);
   va_end(ap);
 }
 #endif

examples/stat/stat_main.c

@@ -81,7 +81,7 @@ static void stepusage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   g_mmafter = mallinfo();
 #else
-  (void)mallinfo(&g_mmafter);
+  mallinfo(&g_mmafter);
 #endif
 
   /* Show the change from the previous loop */
@@ -102,7 +102,7 @@ static void endusage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   g_mmafter = mallinfo();
 #else
-  (void)mallinfo(&g_mmafter);
+  mallinfo(&g_mmafter);
 #endif
   showusage(&g_mmbefore, &g_mmafter, "End-of-test memory leak");
 }
@@ -255,7 +255,7 @@ int main(int argc, FAR char *argv[])
   g_mmbefore = mallinfo();
   g_mmprevious = g_mmbefore;
 #else
-  (void)mallinfo(&g_mmbefore);
+  mallinfo(&g_mmbefore);
   memcpy(&g_mmprevious, &g_mmbefore, sizeof(struct mallinfo));
 #endif
 

examples/tcpblaster/tcpblaster_client.c

@@ -144,7 +144,7 @@ void tcpblaster_client(void)
   partials  = 0;
   totallost = 0;
 
-  (void)clock_gettime(CLOCK_REALTIME, &start);
+  clock_gettime(CLOCK_REALTIME, &start);
 
   for (; ; )
     {
@@ -204,7 +204,7 @@ void tcpblaster_client(void)
           float fkbrecvd;
           float felapsed;
 
-          (void)clock_gettime(CLOCK_REALTIME, &curr);
+          clock_gettime(CLOCK_REALTIME, &curr);
 
           elapsed.tv_sec  = curr.tv_sec - start.tv_sec;
           if (curr.tv_nsec >= start.tv_nsec)
@@ -237,7 +237,7 @@ void tcpblaster_client(void)
           partials   = 0;
           totallost  = 0;
 
-          (void)clock_gettime(CLOCK_REALTIME, &start);
+          clock_gettime(CLOCK_REALTIME, &start);
        }
     }
 

examples/tcpblaster/tcpblaster_server.c

@@ -184,7 +184,7 @@ void tcpblaster_server(void)
   recvcount = 0;
   recvtotal = 0;
 
-  (void)clock_gettime(CLOCK_REALTIME, &start);
+  clock_gettime(CLOCK_REALTIME, &start);
 
   for (; ; )
     {
@@ -233,7 +233,7 @@ void tcpblaster_server(void)
           float fkbsent;
           float felapsed;
 
-          (void)clock_gettime(CLOCK_REALTIME, &curr);
+          clock_gettime(CLOCK_REALTIME, &curr);
 
           elapsed.tv_sec  = curr.tv_sec - start.tv_sec;
           if (curr.tv_nsec >= start.tv_nsec)
@@ -255,7 +255,7 @@ void tcpblaster_server(void)
           recvcount       = 0;
           recvtotal       = 0;
 
-          (void)clock_gettime(CLOCK_REALTIME, &start);
+          clock_gettime(CLOCK_REALTIME, &start);
        }
     }
 

examples/tcpblaster/tcpblaster_target1.c

@@ -117,7 +117,7 @@ int main(int argc, FAR char *argv[])
 
 #if defined(CONFIG_EXAMPLES_TCPBLASTER_LOOPBACK) && defined(CONFIG_SCHED_WAITPID)
   printf("main: Waiting for the server to exit\n");
-  (void)waitpid(child, &statloc, 0);
+  waitpid(child, &statloc, 0);
 #endif
 
   return EXIT_SUCCESS;

examples/timer/timer_main.c

@@ -187,8 +187,8 @@ int main(int argc, FAR char *argv[])
   act.sa_sigaction = timer_sighandler;
   act.sa_flags     = SA_SIGINFO;
 
-  (void)sigfillset(&act.sa_mask);
+  sigfillset(&act.sa_mask);
-  (void)sigdelset(&act.sa_mask, CONFIG_EXAMPLES_TIMER_SIGNO);
+  sigdelset(&act.sa_mask, CONFIG_EXAMPLES_TIMER_SIGNO);
 
   ret = sigaction(CONFIG_EXAMPLES_TIMER_SIGNO, &act, NULL);
   if (ret != OK)
@@ -258,7 +258,7 @@ int main(int argc, FAR char *argv[])
   /* Detach the signal handler */
 
   act.sa_handler = SIG_DFL;
-  (void)sigaction(CONFIG_EXAMPLES_TIMER_SIGNO, &act, NULL);
+  sigaction(CONFIG_EXAMPLES_TIMER_SIGNO, &act, NULL);
 
   /* Show the timer status before starting */
 

examples/udp/udp_target1.c

@@ -57,7 +57,7 @@ int main(int argc, FAR char *argv[])
 #ifdef CONFIG_EXAMPLES_UDP_NETINIT
   /* Initialize the network */
 
-  (void)udp_netinit();
+  udp_netinit();
 #endif
 
   /* Run the server or client, depending upon how we are configured */

examples/udp/udp_target2.c

@@ -57,7 +57,7 @@ int main(int argc, FAR char *argv[])
 #ifdef CONFIG_EXAMPLES_UDP_NETINIT
   /* Initialize the network */
 
-  (void)udp_netinit();
+  udp_netinit();
 #endif
 
   /* Run the server or client, depending upon how target1 was configured */

examples/usbserial/usbserial_main.c

@@ -177,7 +177,7 @@ static int trace_callback(struct usbtrace_s *trace, void *arg)
 
 static void dumptrace(void)
 {
-  (void)usbtrace_enumerate(trace_callback, NULL);
+  usbtrace_enumerate(trace_callback, NULL);
 }
 #else
 #  define dumptrace()

examples/userfs/userfs_main.c

@@ -557,7 +557,7 @@ static int ufstest_stat(FAR void *volinfo, FAR const char *relpath,
       if (ret >= 0)
         {
           ret = ufstest_fstat(volinfo, openinfo, buf);
-          (void)ufstest_close(volinfo, openinfo);
+          ufstest_close(volinfo, openinfo);
         }
     }
 

examples/usrsocktest/usrsocktest_daemon.c

@@ -1614,7 +1614,7 @@ static FAR void *delayed_cmd_thread(FAR void *priv)
 
   usleep(cmd->delay_msec * 1000);
 
-  (void)write(cmd->pipefd, &cmd->cmd, 1);
+  write(cmd->pipefd, &cmd->cmd, 1);
 
   if (!cmd->delay_msec)
     sem_post(&cmd->startsem);
@@ -1718,7 +1718,7 @@ int usrsocktest_daemon_stop(void)
       next = (void *)sq_next(&item->node);
 
       pthread_mutex_unlock(&daemon_mutex);
-      (void)pthread_join(item->tid, &retval);
+      pthread_join(item->tid, &retval);
       pthread_mutex_lock(&daemon_mutex);
       sq_rem(&item->node, &priv->delayed_cmd_threads);
       free(item);
@@ -1881,7 +1881,7 @@ int usrsocktest_daemon_pause_usrsock_handling(bool pause)
 
   priv->do_not_poll_usrsock = pause;
 
-  (void)write(priv->pipefd[1], &cmd, 1);
+  write(priv->pipefd[1], &cmd, 1);
   ret = OK;
 
   pthread_mutex_unlock(&daemon_mutex);
@@ -1916,7 +1916,7 @@ bool usrsocktest_send_delayed_command(const char cmd, unsigned int delay_msec)
   delayed_cmd->delay_msec = delay_msec;
   delayed_cmd->cmd = cmd;
   delayed_cmd->pipefd = priv->pipefd[1];
-  (void)sem_init(&delayed_cmd->startsem, 0, 0);
+  sem_init(&delayed_cmd->startsem, 0, 0);
 
   ret = pthread_attr_init(&attr);
   if (ret != OK)

examples/usrsocktest/usrsocktest_main.c

@@ -100,7 +100,7 @@ static void get_mallinfo(struct mallinfo *mem)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   *mem = mallinfo();
 #else
-  (void)mallinfo(mem);
+  mallinfo(mem);
 #endif
 }
 

examples/webserver/webserver_main.c

@@ -164,7 +164,7 @@ int main(int argc, FAR char *argv[])
   if (handle)
     {
         struct dhcpc_state ds;
-        (void)dhcpc_request(handle, &ds);
+        dhcpc_request(handle, &ds);
         netlib_set_ipv4addr("eth0", &ds.ipaddr);
 
         if (ds.netmask.s_addr != 0)

examples/wget/wget_main.c

@@ -95,7 +95,7 @@ static char g_iobuffer[512];
 static void callback(FAR char **buffer, int offset, int datend,
                      FAR int *buflen, FAR void *arg)
 {
-  (void)write(1, &((*buffer)[offset]), datend - offset);
+  write(1, &((*buffer)[offset]), datend - offset);
 }
 
 /****************************************************************************

examples/xmlrpc/xmlrpc_main.c

@@ -332,7 +332,7 @@ static int xmlrpc_netinit(void)
   if (handle)
     {
       struct dhcpc_state ds;
-      (void)dhcpc_request(handle, &ds);
+      dhcpc_request(handle, &ds);
       netlib_set_ipv4addr("eth0", &ds.ipaddr);
 
       if (ds.netmask.s_addr != 0)

examples/zerocross/zerocross_main.c

@@ -122,8 +122,8 @@ int main(int argc, FAR char *argv[])
 
       /* Wait for a signal */
 
-      (void)sigemptyset(&set);
+      sigemptyset(&set);
-      (void)sigaddset(&set, CONFIG_EXAMPLES_ZEROCROSS_SIGNO);
+      sigaddset(&set, CONFIG_EXAMPLES_ZEROCROSS_SIGNO);
       ret = sigwaitinfo(&set, &value);
       if (ret < 0)
         {

fsutils/flash_eraseall/flash_eraseall.c

@@ -90,7 +90,7 @@ int flash_eraseall(FAR const char *driver)
 
       /* Close the block driver */
 
-     (void)close(fd);
+     close(fd);
     }
 
   return ret;

fsutils/inifile/inifile.c

@@ -217,7 +217,7 @@ static int inifile_read_line(FAR struct inifile_state_s *priv)
 
   if (priv->nextch != EOF)
     {
-      (void)inifile_next_line(priv);
+      inifile_next_line(priv);
     }
 
   /* And return the number of bytes read (excluding the NUL terminator and

fsutils/mkfatfs/mkfatfs.c

@@ -366,7 +366,7 @@ int mkfatfs(FAR const char *pathname, FAR struct fat_format_s *fmt)
 errout_with_driver:
   /* Close the driver */
 
-  (void)close(var.fv_fd);
+  close(var.fv_fd);
 
 errout:
   /* Release all allocated memory */

fsutils/mksmartfs/mksmartfs.c

@@ -229,7 +229,7 @@ int mksmartfs(FAR const char *pathname, uint16_t sectorsize)
 errout_with_driver:
   /* Close the driver */
 
-  (void)close(fd);
+  close(fd);
 
 errout:
   /* Release all allocated memory */

fsutils/passwd/passwd_adduser.c

@@ -102,6 +102,6 @@ int passwd_adduser(FAR const char *username, FAR const char *password)
   ret = OK;
 
 errout_with_lock:
-  (void)passwd_unlock(sem);
+  passwd_unlock(sem);
   return ret;
 }

fsutils/passwd/passwd_append.c

@@ -111,6 +111,6 @@ int passwd_append(FAR const char *username, FAR const char *password)
   ret = OK;
 
 errout_with_stream:
-  (void)fclose(stream);
+  fclose(stream);
   return ret;
 }

fsutils/passwd/passwd_delete.c

@@ -298,25 +298,25 @@ int passwd_delete(off_t offset)
   ret = passwd_copyfile(iobuffer, instream, outstream, SIZE_MAX);
 
 errout_with_outstream:
-  (void)fclose(outstream);
+  fclose(outstream);
 
 errout_with_instream:
-  (void)fclose(instream);
+  fclose(instream);
 
 errout_with_tmpfile:
   if (ret < 0)
     {
       /* Restore the previous /etc/passwd file */
 
-      (void)unlink(CONFIG_FSUTILS_PASSWD_PATH);
+      unlink(CONFIG_FSUTILS_PASSWD_PATH);
-      (void)rename(CONFIG_FSUTILS_PASSWD_PATH ".tmp",
+      rename(CONFIG_FSUTILS_PASSWD_PATH ".tmp",
-                   CONFIG_FSUTILS_PASSWD_PATH);
+             CONFIG_FSUTILS_PASSWD_PATH);
     }
   else
     {
       /* Delete the previous /etc/passwd file */
 
-      (void)unlink(CONFIG_FSUTILS_PASSWD_PATH ".tmp");
+      unlink(CONFIG_FSUTILS_PASSWD_PATH ".tmp");
     }
 
 errout_with_iobuffer:

fsutils/passwd/passwd_deluser.c

@@ -92,6 +92,6 @@ int passwd_deluser(FAR const char *username)
   ret = passwd_delete(passwd.offset);
 
 errout_with_lock:
-  (void)passwd_unlock(sem);
+  passwd_unlock(sem);
   return ret;
 }

fsutils/passwd/passwd_lock.c

@@ -130,7 +130,7 @@ int passwd_unlock(FAR sem_t *sem)
 #ifdef CONFIG_FS_NAMED_SEMAPHORES
   /* Close the named semaphore */
 
-  (void)sem_close(sem);
+  sem_close(sem);
 #endif
 
   return OK;

fsutils/passwd/passwd_update.c

@@ -98,6 +98,6 @@ int passwd_update(FAR const char *username, FAR const char *password)
   ret = passwd_append(username, password);
 
 errout_with_lock:
-  (void)passwd_unlock(sem);
+  passwd_unlock(sem);
   return ret;
 }

fsutils/passwd/passwd_verify.c

@@ -101,6 +101,6 @@ int passwd_verify(FAR const char *username, FAR const char *password)
   ret = (strcmp(passwd.encrypted, encrypted) == 0) ? 1 : 0;
 
 errout_with_lock:
-  (void)passwd_unlock(sem);
+  passwd_unlock(sem);
   return ret;
 }

graphics/ft80x/ft80x_coproc.c

@@ -146,7 +146,7 @@ int ft80x_coproc_waitlogo(int fd)
 
       /* Wait for a half of a second */
 
-      (void)usleep(HALF_SECOND);
+      usleep(HALF_SECOND);
     }
 
   ft80x_err("ERROR:  Timed out!  Last head/tail = %u/%u\n", head, tail);

graphics/ft80x/ft80x_ramcmd.c

@@ -264,8 +264,8 @@ int ft80x_ramcmd_waitfifoempty(int fd)
 
   /* Block the signal so that it will pend if received asynchronously */
 
-  (void)sigemptyset(&set);
+  sigemptyset(&set);
-  (void)sigaddset(&set, CONFIG_GRAPHICS_FT80X_CMDEMPTY_SIGNAL);
+  sigaddset(&set, CONFIG_GRAPHICS_FT80X_CMDEMPTY_SIGNAL);
 
   ret = pthread_sigmask(SIG_BLOCK, &set, NULL);
   if (ret < 0)
@@ -335,8 +335,8 @@ int ft80x_ramcmd_waitfifoempty(int fd)
       /* Make sure that the event notification is again disabled */
 
       notify.enable = false;
-      (void)ioctl(fd, FT80X_IOC_EVENTNOTIFY,
+      ioctl(fd, FT80X_IOC_EVENTNOTIFY,
-                  (unsigned long)((uintptr_t)&notify));
+            (unsigned long)((uintptr_t)&notify));
 
       /* Check if the signal was received correctly or if the timeout occurred. */
 
@@ -353,6 +353,6 @@ int ft80x_ramcmd_waitfifoempty(int fd)
         }
     }
 
-  (void)pthread_sigmask(SIG_UNBLOCK, &set, NULL);
+  pthread_sigmask(SIG_UNBLOCK, &set, NULL);
   return ret;
 }

graphics/ft80x/ft80x_touch.c

@@ -167,8 +167,8 @@ int ft80x_touch_waittag(int fd, uint8_t oldtag)
 
   /* Block the signal so that it will pend if received asynchronously */
 
-  (void)sigemptyset(&set);
+  sigemptyset(&set);
-  (void)sigaddset(&set, CONFIG_GRAPHICS_FT80X_TAG_SIGNAL);
+  sigaddset(&set, CONFIG_GRAPHICS_FT80X_TAG_SIGNAL);
 
   ret = pthread_sigmask(SIG_BLOCK, &set, NULL);
   if (ret < 0)
@@ -236,8 +236,8 @@ int ft80x_touch_waittag(int fd, uint8_t oldtag)
       /* Make sure that the event notification is again disabled */
 
       notify.enable = false;
-      (void)ioctl(fd, FT80X_IOC_EVENTNOTIFY,
+      ioctl(fd, FT80X_IOC_EVENTNOTIFY,
-                  (unsigned long)((uintptr_t)&notify));
+            (unsigned long)((uintptr_t)&notify));
 
       /* Check if the signal was received correctly or if the timeout occurred. */
 
@@ -254,7 +254,7 @@ int ft80x_touch_waittag(int fd, uint8_t oldtag)
         }
     }
 
-  (void)pthread_sigmask(SIG_UNBLOCK, &set, NULL);
+  pthread_sigmask(SIG_UNBLOCK, &set, NULL);
   return tag;
 }
 

graphics/nxwidgets/UnitTests/CButton/cbuttontest.cxx

@@ -284,7 +284,7 @@ void CButtonTest::click(void)
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_LEFTBUTTON);
+  nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_LEFTBUTTON);
 }
 
 // The counterpart to click.  This simulates a button release through
@@ -304,7 +304,7 @@ void CButtonTest::release(void)
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_NOBUTTONS);
+  nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_NOBUTTONS);
 }
 
 // Widget events are normally handled in a modal loop.

graphics/nxwidgets/UnitTests/CButtonArray/cbuttonarray_main.cxx

@@ -102,7 +102,7 @@ static void updateMemoryUsage(unsigned int previous,
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -132,7 +132,7 @@ static void initMemoryUsage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   g_mmInitial  = mmcurrent.uordblks;

graphics/nxwidgets/UnitTests/CButtonArray/cbuttonarraytest.cxx

@@ -255,7 +255,7 @@ void CButtonArrayTest::click(CButtonArray *buttonArray, int column, int row)
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, buttonX, buttonY, NX_MOUSE_LEFTBUTTON);
+  nx_mousein(handle, buttonX, buttonY, NX_MOUSE_LEFTBUTTON);
 }
 
 // The counterpart to click.  This simulates a button release through
@@ -284,7 +284,7 @@ void CButtonArrayTest::release(CButtonArray *buttonArray, int column, int row)
 
   // Then inject the mouse release
 
-  (void)nx_mousein(handle, buttonX, buttonY, NX_MOUSE_NOBUTTONS);
+  nx_mousein(handle, buttonX, buttonY, NX_MOUSE_NOBUTTONS);
 }
 
 // Widget events are normally handled in a modal loop.

graphics/nxwidgets/UnitTests/CCheckBox/ccheckbox_main.cxx

@@ -93,7 +93,7 @@ static void updateMemoryUsage(unsigned int previous,
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -120,7 +120,7 @@ static void initMemoryUsage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   g_mmInitial  = mmcurrent.uordblks;

graphics/nxwidgets/UnitTests/CCheckBox/ccheckboxtest.cxx

@@ -249,7 +249,7 @@ void CCheckBoxTest::clickCheckBox(void)
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, checkboxX, checkboxY, NX_MOUSE_LEFTBUTTON);
+  nx_mousein(handle, checkboxX, checkboxY, NX_MOUSE_LEFTBUTTON);
 
   // Poll for mouse events
   //
@@ -262,7 +262,7 @@ void CCheckBoxTest::clickCheckBox(void)
 
   // Then inject the mouse release
 
-  (void)nx_mousein(handle, checkboxX, checkboxY, 0);
+  nx_mousein(handle, checkboxX, checkboxY, 0);
 
   // And poll for more mouse events
 

graphics/nxwidgets/UnitTests/CGlyphButton/cglyphbutton_main.cxx

@@ -92,7 +92,7 @@ static void updateMemoryUsage(unsigned int previous,
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -119,7 +119,7 @@ static void initMemoryUsage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   g_mmInitial  = mmcurrent.uordblks;

graphics/nxwidgets/UnitTests/CGlyphButton/cglyphbuttontest.cxx

@@ -266,7 +266,7 @@ void CGlyphButtonTest::click(void)
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_LEFTBUTTON);
+  nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_LEFTBUTTON);
 }
 
 // The counterpart to click.  This simulates a button release through
@@ -286,7 +286,7 @@ void CGlyphButtonTest::release(void)
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_NOBUTTONS);
+  nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_NOBUTTONS);
 }
 
 // Widget events are normally handled in a modal loop.

graphics/nxwidgets/UnitTests/CGlyphSliderHorizontal/cglyphsliderhorizontal_main.cxx

@@ -93,7 +93,7 @@ static void updateMemoryUsage(unsigned int previous,
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -120,7 +120,7 @@ static void initMemoryUsage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   g_mmInitial  = mmcurrent.uordblks;

graphics/nxwidgets/UnitTests/CImage/cimage_main.cxx

@@ -109,7 +109,7 @@ static void updateMemoryUsage(FAR struct mallinfo *previous,
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -136,7 +136,7 @@ static void initMemoryUsage(void)
   g_mmInitial = mallinfo();
   g_mmprevious = g_mmInitial;
 #else
-  (void)mallinfo(&g_mmInitial);
+  mallinfo(&g_mmInitial);
   memcpy(&g_mmprevious, &g_mmInitial, sizeof(struct mallinfo));
 #endif
 }

graphics/nxwidgets/UnitTests/CKeypad/ckeypad_main.cxx

@@ -92,7 +92,7 @@ static void updateMemoryUsage(unsigned int previous,
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -122,7 +122,7 @@ static void initMemoryUsage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   g_mmInitial  = mmcurrent.uordblks;

graphics/nxwidgets/UnitTests/CKeypad/ckeypadtest.cxx

@@ -369,7 +369,7 @@ void CKeypadTest::click(CKeypad *keypad, int column, int row)
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, buttonX, buttonY, NX_MOUSE_LEFTBUTTON);
+  nx_mousein(handle, buttonX, buttonY, NX_MOUSE_LEFTBUTTON);
 }
 
 // The counterpart to click.  This simulates a button release through
@@ -398,7 +398,7 @@ void CKeypadTest::release(CKeypad *keypad, int column, int row)
 
   // Then inject the mouse release
 
-  (void)nx_mousein(handle, buttonX, buttonY, NX_MOUSE_NOBUTTONS);
+  nx_mousein(handle, buttonX, buttonY, NX_MOUSE_NOBUTTONS);
 }
 
 // Widget events are normally handled in a modal loop.

graphics/nxwidgets/UnitTests/CLatchButton/clatchbuttontest.cxx

@@ -285,7 +285,7 @@ void CLatchButtonTest::click(void)
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_LEFTBUTTON);
+  nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_LEFTBUTTON);
 }
 
 // The counterpart to click.  This simulates a button release through
@@ -305,7 +305,7 @@ void CLatchButtonTest::release(void)
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_NOBUTTONS);
+  nx_mousein(handle, m_center.x, m_center.y, NX_MOUSE_NOBUTTONS);
 }
 
 // Widget events are normally handled in a modal loop.

graphics/nxwidgets/UnitTests/CLatchButtonArray/clatchbuttonarray_main.cxx

@@ -128,7 +128,7 @@ static void updateMemoryUsage(unsigned int previous,
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -158,7 +158,7 @@ static void initMemoryUsage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   g_mmInitial  = mmcurrent.uordblks;

graphics/nxwidgets/UnitTests/CLatchButtonArray/clatchbuttonarraytest.cxx

@@ -255,7 +255,7 @@ void CLatchButtonArrayTest::click(CLatchButtonArray *buttonArray, int column, in
 
   // Then inject the mouse click
 
-  (void)nx_mousein(handle, buttonX, buttonY, NX_MOUSE_LEFTBUTTON);
+  nx_mousein(handle, buttonX, buttonY, NX_MOUSE_LEFTBUTTON);
 }
 
 // The counterpart to click.  This simulates a button release through
@@ -284,7 +284,7 @@ void CLatchButtonArrayTest::release(CLatchButtonArray *buttonArray, int column,
 
   // Then inject the mouse release
 
-  (void)nx_mousein(handle, buttonX, buttonY, NX_MOUSE_NOBUTTONS);
+  nx_mousein(handle, buttonX, buttonY, NX_MOUSE_NOBUTTONS);
 }
 
 // Widget events are normally handled in a modal loop.

graphics/nxwidgets/UnitTests/CListBox/clistbox_main.cxx

@@ -128,7 +128,7 @@ static void updateMemoryUsage(unsigned int previous,
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   /* Show the change from the previous time */
@@ -158,7 +158,7 @@ static void initMemoryUsage(void)
 #ifdef CONFIG_CAN_PASS_STRUCTS
   mmcurrent = mallinfo();
 #else
-  (void)mallinfo(&mmcurrent);
+  mallinfo(&mmcurrent);
 #endif
 
   g_mmInitial  = mmcurrent.uordblks;