change the hardcoded error constant (0x80000000UL) to a nice flexible define (BB_GETOPT_ERROR)
diff --git a/util-linux/hwclock.c b/util-linux/hwclock.c
index 2f62661..3c26839 100644
--- a/util-linux/hwclock.c
+++ b/util-linux/hwclock.c
@@ -208,7 +208,7 @@
 	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();
 	}