net/sched: Refactor qdisc_graft() for ingress and clsact Qdiscs

Grafting ingress and clsact Qdiscs does not need a for-loop in
qdisc_graft().  Refactor it.  No functional changes intended.

Tested-by: Pedro Tammela <pctammela@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Vlad Buslov <vladbu@nvidia.com>
Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

net/sched/sch_api.c

@@ -1079,12 +1079,12 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
 
 	if (parent == NULL) {
 		unsigned int i, num_q, ingress;
+		struct netdev_queue *dev_queue;
 
 		ingress = 0;
 		num_q = dev->num_tx_queues;
 		if ((q && q->flags & TCQ_F_INGRESS) ||
 		    (new && new->flags & TCQ_F_INGRESS)) {
-			num_q = 1;
 			ingress = 1;
 			if (!dev_ingress_queue(dev)) {
 				NL_SET_ERR_MSG(extack, "Device does not have an ingress queue");
@@ -1100,19 +1100,19 @@ static int qdisc_graft(struct net_device *dev, struct Qdisc *parent,
 		if (new && new->ops->attach && !ingress)
 			goto skip;
 
+		if (!ingress) {
 			for (i = 0; i < num_q; i++) {
-			struct netdev_queue *dev_queue = dev_ingress_queue(dev);
-
-			if (!ingress)
 				dev_queue = netdev_get_tx_queue(dev, i);
-
 				old = dev_graft_qdisc(dev_queue, new);
+
 				if (new && i > 0)
 					qdisc_refcount_inc(new);
-
-			if (!ingress)
 				qdisc_put(old);
 			}
+		} else {
+			dev_queue = dev_ingress_queue(dev);
+			old = dev_graft_qdisc(dev_queue, new);
+		}
 
 skip:
 		if (!ingress) {