change the hardcoded error constant (0x80000000UL) to a nice flexible define (BB_GETOPT_ERROR)

util-linux/hwclock.c

@@ -208,7 +208,7 @@ static const struct option hwclock_long_options[] = {
 	bb_opt_complementaly = "r~ws:w~rs:s~wr:l~u:u~l";
 	opt = bb_getopt_ulflags(argc, argv, "lursw");
 	/* Check only one mode was given */
-	if(opt & 0x80000000UL) {
+	if(opt & BB_GETOPT_ERROR) {
 		bb_show_usage();
 	}