pie: use qdisc_dequeue_head wrapper

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_pie.c

@@ -511,7 +511,7 @@ static int pie_dump_stats(struct Qdisc *sch, struct gnet_dump *d)
 static struct sk_buff *pie_qdisc_dequeue(struct Qdisc *sch)
 {
 	struct sk_buff *skb;
-	skb = __qdisc_dequeue_head(sch, &sch->q);
+	skb = qdisc_dequeue_head(sch);
 
 	if (!skb)
 		return NULL;