pkt_sched: sch_drr: Fix qlen in drr_drop()

Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sched/sch_drr.c

@@ -406,6 +406,7 @@ static unsigned int drr_drop(struct Qdisc *sch)
 		if (cl->qdisc->ops->drop) {
 			len = cl->qdisc->ops->drop(cl->qdisc);
 			if (len > 0) {
+				sch->q.qlen--;
 				if (cl->qdisc->q.qlen == 0)
 					list_del(&cl->alist);
 				return len;