sched: replace __skb_dequeue with __qdisc_dequeue_head

After previous patch these functions are identical.
Replace __skb_dequeue in qdiscs with __qdisc_dequeue_head.

Next patch will then make __qdisc_dequeue_head handle
single-linked list instead of strcut sk_buff_head argument.

Doesn't change generated code.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_codel.c

@@ -69,7 +69,7 @@ struct codel_sched_data {
 static struct sk_buff *dequeue_func(struct codel_vars *vars, void *ctx)
 {
 	struct Qdisc *sch = ctx;
-	struct sk_buff *skb = __skb_dequeue(&sch->q);
+	struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
 
 	if (skb)
 		sch->qstats.backlog -= qdisc_pkt_len(skb);
@@ -172,7 +172,7 @@ static int codel_change(struct Qdisc *sch, struct nlattr *opt)
 
 	qlen = sch->q.qlen;
 	while (sch->q.qlen > sch->limit) {
-		struct sk_buff *skb = __skb_dequeue(&sch->q);
+		struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
 
 		dropped += qdisc_pkt_len(skb);
 		qdisc_qstats_backlog_dec(sch, skb);

net/sched/sch_netem.c

@@ -587,7 +587,7 @@ static struct sk_buff *netem_dequeue(struct Qdisc *sch)
 	struct rb_node *p;
 
 tfifo_dequeue:
-	skb = __skb_dequeue(&sch->q);
+	skb = __qdisc_dequeue_head(&sch->q);
 	if (skb) {
 		qdisc_qstats_backlog_dec(sch, skb);
 deliver:

net/sched/sch_pie.c

@@ -231,7 +231,7 @@ static int pie_change(struct Qdisc *sch, struct nlattr *opt)
 	/* Drop excess packets if new limit is lower */
 	qlen = sch->q.qlen;
 	while (sch->q.qlen > sch->limit) {
-		struct sk_buff *skb = __skb_dequeue(&sch->q);
+		struct sk_buff *skb = __qdisc_dequeue_head(&sch->q);
 
 		dropped += qdisc_pkt_len(skb);
 		qdisc_qstats_backlog_dec(sch, skb);