More fixes to issues noted by cppcheck

examples/cc3000/cc3000basic.c

@@ -305,7 +305,7 @@ void AsyncEventPrint(void)
       break;
 
     default:
-      printf("AsyncCallback called with unhandled event! (0x%lx)\n", \
+      printf("AsyncCallback called with unhandled event! (0x%lx)\n",
              (unsigned long)lastAsyncEvent);
       break;
     }

examples/ostest/mqueue.c

@@ -403,7 +403,7 @@ void mqueue_test(void)
   pthread_join(receiver, &result);
   if (result != expected)
     {
-      printf("mqueue_test: ERROR receiver thread should have exited with %d\n",
+      printf("mqueue_test: ERROR receiver thread should have exited with %p\n",
              expected);
       printf("             ERROR Instead exited with nerrors=%d\n",
              (int)result);

examples/ostest/mutex.c

@@ -137,6 +137,6 @@ void mutex_test(void)
 #endif
 
   printf("\t\tThread1\tThread2\n");
-  printf("\tLoops\t%ld\t%ld\n", nloops[0], nloops[1]);
-  printf("\tErrors\t%ld\t%ld\n", nerrors[0], nerrors[1]);
+  printf("\tLoops\t%lu\t%lu\n", nloops[0], nloops[1]);
+  printf("\tErrors\t%lu\t%lu\n", nerrors[0], nerrors[1]);
 }

examples/ostest/sighand.c

@@ -204,7 +204,7 @@ static int waiter_main(int argc, char *argv[])
   /* Detach the signal handler */
 
   act.sa_sigaction = SIG_DFL;
-  status = sigaction(WAKEUP_SIGNAL, &act, &oact);
+  (void)sigaction(WAKEUP_SIGNAL, &act, &oact);
 
   printf("waiter_main: done\n" );
   FFLUSH();
@@ -223,7 +223,6 @@ void sighand_test(void)
   struct sched_param param;
   union sigval sigvalue;
   pid_t waiterpid;
-  int policy;
   int status;
 
   printf("sighand_test: Initializing semaphore to 0\n" );
@@ -265,13 +264,6 @@ void sighand_test(void)
       param.sched_priority = PTHREAD_DEFAULT_PRIORITY;
     }
 
-  policy = sched_getscheduler(0);
-  if (policy == ERROR)
-    {
-      printf("sighand_test: ERROR sched_getscheduler() failed\n" );
-      policy = SCHED_FIFO;
-    }
-
   waiterpid = task_create("waiter", param.sched_priority,
                            PTHREAD_STACK_DEFAULT, waiter_main, NULL);
   if (waiterpid == ERROR)
@@ -326,7 +318,7 @@ void sighand_test(void)
 
 #ifdef CONFIG_SCHED_HAVE_PARENT
   act.sa_sigaction = SIG_DFL;
-  status = sigaction(SIGCHLD, &act, &oact);
+  (void)sigaction(SIGCHLD, &act, &oact);
 #endif
 
   printf("sighand_test: done\n" );

examples/ostest/timedmqueue.c

@@ -124,7 +124,7 @@ static void *sender_thread(void *arg)
    */
 
   g_send_mqfd = mq_open("timedmq", O_WRONLY|O_CREAT, 0666, &attr);
-  if (g_send_mqfd < 0)
+  if (g_send_mqfd == (mqd_t)-1)
     {
         printf("sender_thread: ERROR mq_open failed\n");
         pthread_exit((pthread_addr_t)1);
@@ -221,7 +221,7 @@ static void *receiver_thread(void *arg)
    */
 
    g_recv_mqfd = mq_open("timedmq", O_RDONLY|O_CREAT, 0666, &attr);
-   if (g_recv_mqfd < 0)
+   if (g_recv_mqfd == (mqd_t)-1)
      {
        printf("receiver_thread: ERROR mq_open failed\n");
        pthread_exit((pthread_addr_t)1);

examples/pashello/pashello.c

@@ -81,7 +81,6 @@ int main(int argc, FAR char *argv[])
 int pashello_main(int argc, FAR char *argv[])
 #endif
 {
-  FAR struct pexec_s *st;
   int exitcode = EXIT_SUCCESS;
   int ret;
 

examples/pipe/interlock_test.c

@@ -172,8 +172,8 @@ int interlock_test(void)
     }
   else if (ret != 0)
     {
-      fprintf(stderr, "interlock_test: Read %d bytes of data -- aborting: %d\n",
-              nbytes, errno);
+      fprintf(stderr, "interlock_test: Read %ld bytes of data -- aborting: %d\n",
+              (long)nbytes, errno);
       ret = 5;
       goto errout_with_file;
     }

examples/pwm/pwm_main.c

@@ -124,14 +124,14 @@ static void pwm_help(FAR struct pwm_state_s *pwm)
         "Default: %s Current: %s\n",
         CONFIG_EXAMPLES_PWM_DEVPATH, pwm->devpath ? pwm->devpath : "NONE");
   printf("  [-f frequency] selects the pulse frequency.  "
-        "Default: %d Hz Current: %d Hz\n",
+        "Default: %d Hz Current: %u Hz\n",
         CONFIG_EXAMPLES_PWM_FREQUENCY, pwm->freq);
   printf("  [-d duty] selects the pulse duty as a percentage.  "
          "Default: %d %% Current: %d %%\n",
          CONFIG_EXAMPLES_PWM_DUTYPCT, pwm->duty);
 #ifdef CONFIG_PWM_PULSECOUNT
   printf("  [-n count] selects the pulse count.  "
-        "Default: %d Current: %d\n",
+        "Default: %d Current: %u\n",
         CONFIG_EXAMPLES_PWM_PULSECOUNT, pwm->count);
 #endif
   printf("  [-t duration] is the duration of the pulse train in seconds.  "
@@ -336,11 +336,11 @@ int pwm_main(int argc, char *argv[])
 #ifdef CONFIG_PWM_PULSECOUNT
   info.count     = g_pwmstate.count;
 
-  printf("pwm_main: starting output with frequency: %d duty: %08x count: %d\n",
+  printf("pwm_main: starting output with frequency: %u duty: %08x count: %u\n",
          info.frequency, info.duty, info.count);
 
 #else
-  printf("pwm_main: starting output with frequency: %d duty: %08x\n",
+  printf("pwm_main: starting output with frequency: %u duty: %08x\n",
          info.frequency, info.duty);
 
 #endif

examples/qencoder/qe_main.c

@@ -315,7 +315,7 @@ int qe_main(int argc, char *argv[])
    */
 
 #if defined(CONFIG_NSH_BUILTIN_APPS)
-  printf("qe_main: Number of samples: %d\n", g_qeexample.nloops);
+  printf("qe_main: Number of samples: %u\n", g_qeexample.nloops);
   for (nloops = 0; nloops < g_qeexample.nloops; nloops++)
 #elif defined(CONFIG_EXAMPLES_QENCODER_NSAMPLES)
   printf("qe_main: Number of samples: %d\n", CONFIG_EXAMPLES_QENCODER_NSAMPLES);

examples/relays/relays_main.c

@@ -98,7 +98,6 @@ int relays_main(int argc, char *argv[])
   uint32_t r_stat;
   int option;
   int n = -1;
-  int ret = -1;
   int i;
 
   while ((option = getopt(argc, argv, ":n:")) != ERROR)