Exit with EXIT_SUCCESS/EXIT_FAILURE instead of 0 and 1

Fixed for consistency purposes.

touch.c

@@ -42,7 +42,7 @@ main(int argc, char *argv[])
 	for(; argc > 0; argc--, argv++)
 		touch(argv[0]);
 
-	return 0;
+	return EXIT_SUCCESS;
 }
 
 void