tc: fill in handle before checking argc

When deleting a specific basic filter with handle,
tc command always ignores the 'handle' option, so
tcm_handle is always 0 and kernel deletes all filters
in the selected group. This is wrong, we should respect
'handle' in cmdline.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

tc/f_basic.c

@@ -43,9 +43,6 @@ static int basic_parse_opt(struct filter_util *qu, char *handle,
 	struct rtattr *tail;
 	long h = 0;
 
-	if (argc == 0)
-		return 0;
-
 	if (handle) {
 		h = strtol(handle, NULL, 0);
 		if (h == LONG_MIN || h == LONG_MAX) {
@@ -54,9 +51,11 @@ static int basic_parse_opt(struct filter_util *qu, char *handle,
 			return -1;
 		}
 	}
-
 	t->tcm_handle = h;
 
+	if (argc == 0)
+		return 0;
+
 	tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
 	addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);