Remove all references to the now non-existent boardctl(BOARD_TSCTEST_TEARDOWN).

examples/README.txt

@@ -1993,10 +1993,9 @@ examples/touchscreen
   This example code will call boardctl() to setup the touchscreen driver
   for texting.  The implementation of boardctl() will require that board-
   specific logic  provide the following interfaces that will be called by
-  the boardctl() in order to initialize and uninitialize the touchscreen hardware:
+  the boardctl() in order to initialize the touchscreen hardware:
 
     int board_tsc_setup(int minor);
-    void board_tsc_teardown(void);
 
 examples/uavcan
 ^^^^^^^^^^^^^^^

examples/touchscreen/Kconfig

@@ -61,9 +61,8 @@ config EXAMPLES_TOUCHSCREEN_ARCHINIT
 		mouse is disconnected.
 
 		So, in cases like this, there are two options:  (1) provide dummy
-		board_tsc_setup() and board_tsc_teardown() just to satisfy the
-		linking requirements of boardctl() or, (2) de-select this option.
-		If this option is de-selected, then the boardctl() will never be
-		called.
+		board_tsc_setup() just to satisfy the linking requirements of
+		boardctl() or, (2) de-select this option.  If this option is de-
+		selected, then the boardctl() will never be called.
 
 endif

examples/touchscreen/tc_main.c

@@ -149,7 +149,7 @@ int tc_main(int argc, char *argv[])
       printf("tc_main: open %s failed: %d\n",
               CONFIG_EXAMPLES_TOUCHSCREEN_DEVPATH, errno);
       errval = 2;
-      goto errout_with_tc;
+      goto errout;
     }
 
   /* Now loop the appropriate number of times, displaying the collected
@@ -259,12 +259,7 @@ int tc_main(int argc, char *argv[])
 errout_with_dev:
   close(fd);
 
-errout_with_tc:
-#ifdef CONFIG_EXAMPLES_TOUCHSCREEN_ARCHINIT
-  boardctl(BOARDIOC_TSCTEST_TEARDOWN, 0);
-
 errout:
-#endif
   printf("Terminating!\n");
   fflush(stdout);
   return errval;