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/modutils/rmmod.c b/modutils/rmmod.c
index 26bad7d..4a38e35 100644
--- a/modutils/rmmod.c
+++ b/modutils/rmmod.c
@@ -47,7 +47,7 @@
 #define misc_buf bb_common_bufsiz1
 
 	/* Parse command line. */
-	n = getopt32(argc, argv, "wfa");
+	n = getopt32(argv, "wfa");
 	if (n & 1)	// --wait
 		flags &= ~O_NONBLOCK;
 	if (n & 2)	// --force