ipcrm: small code shrink

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/util-linux/ipcrm.c b/util-linux/ipcrm.c
index 731216c..e597ed6 100644
--- a/util-linux/ipcrm.c
+++ b/util-linux/ipcrm.c
@@ -40,7 +40,7 @@
 	MSG
 } type_id;
 
-static int remove_ids(type_id type, int argc, char **argv)
+static int remove_ids(type_id type, char **argv)
 {
 	unsigned long id;
 	int nb_errors = 0;
@@ -48,7 +48,7 @@
 
 	arg.val = 0;
 
-	while (argc) {
+	while (argv[0]) {
 		id = bb_strtoul(argv[0], NULL, 10);
 		if (errno || id > INT_MAX) {
 			bb_error_msg("invalid id: %s", argv[0]);
@@ -67,7 +67,6 @@
 				nb_errors++;
 			}
 		}
-		argc--;
 		argv++;
 	}
 
@@ -109,7 +108,7 @@
 			else if (w == 'e')
 				what = SEM;
 
-			if (remove_ids(what, argc-2, &argv[2]))
+			if (remove_ids(what, &argv[2]))
 				fflush_stdout_and_exit(EXIT_FAILURE);
 			printf("resource(s) deleted\n");
 			return 0;