don't pass argc in getopt32, it's superfluous

(add/remove: 0/0 grow/shrink: 12/131 up/down: 91/-727) Total: -636 bytes
   text    data     bss     dec     hex filename
 773469    1058   11092  785619   bfcd3 busybox_old
 772644    1058   11092  784794   bf99a busybox_unstripped

diff --git a/util-linux/dmesg.c b/util-linux/dmesg.c
index 0c1c6fa..909cbd2 100644
--- a/util-linux/dmesg.c
+++ b/util-linux/dmesg.c
@@ -16,7 +16,7 @@
 int dmesg_main(int argc, char **argv)
 {
 	char *size, *level;
-	int flags = getopt32(argc, argv, "cs:n:", &size, &level);
+	int flags = getopt32(argv, "cs:n:", &size, &level);
 
 	if (flags & 4) {
 		if (klogctl(8, NULL, xatoul_range(level, 0, 10)))