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/coreutils/du.c b/coreutils/du.c
index 1974871..757fa14 100644
--- a/coreutils/du.c
+++ b/coreutils/du.c
@@ -170,7 +170,7 @@
 	 */
 #if ENABLE_FEATURE_HUMAN_READABLE
 	opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
-	opt = getopt32(argc, argv, "aHkLsx" "d:" "lc" "hm", &smax_print_depth);
+	opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &smax_print_depth);
 	if (opt & (1 << 9)) {
 		/* -h opt */
 		disp_hr = 0;
@@ -185,7 +185,7 @@
 	}
 #else
 	opt_complementary = "H-L:L-H:s-d:d-s";
-	opt = getopt32(argc, argv, "aHkLsx" "d:" "lc", &smax_print_depth);
+	opt = getopt32(argv, "aHkLsx" "d:" "lc", &smax_print_depth);
 #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
 	if (opt & (1 << 2)) {
 		/* -k opt */