Exit with EXIT_SUCCESS/EXIT_FAILURE instead of 0 and 1

Fixed for consistency purposes.

chmod.c

@@ -37,7 +37,7 @@ main(int argc, char *argv[])
 	parsemode(argv[0]);
 	for(++argv; argc > 0; argc--)
 		chmodr(argv[0]);
-	return 0;
+	return EXIT_SUCCESS;
 }
 
 void