tc: allow qdisc without options

Pfifo_fast needs no options. So don't force it to have parsing code.

tc/tc_qdisc.c

@@ -137,6 +137,7 @@ static int tc_qdisc_modify(int cmd, unsigned flags, int argc, char **argv)
 	if (est.ewma_log)
 		addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
 
+	if (argc) {
 		if (q) {
 			if (!q->parse_qopt) {
 				fprintf(stderr, "qdisc '%s' does not support option parsing\n", k);
@@ -145,7 +146,6 @@ static int tc_qdisc_modify(int cmd, unsigned flags, int argc, char **argv)
 			if (q->parse_qopt(q, argc, argv, &req.n))
 				return 1;
 		} else {
-		if (argc) {
 			if (matches(*argv, "help") == 0)
 				usage();