net_sched: update bstats in dequeue()

Class bytes/packets stats can be misleading because they are updated in
enqueue() while packet might be dropped later.

We already fixed all qdiscs but sch_atm.

This patch makes the final cleanup.

class rate estimators can now match qdisc ones.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_drr.c b/net/sched/sch_drr.c
index c218987..9ce0b4f 100644
--- a/net/sched/sch_drr.c
+++ b/net/sched/sch_drr.c
@@ -376,8 +376,6 @@
 		cl->deficit = cl->quantum;
 	}
 
-	bstats_update(&cl->bstats, skb);
-
 	sch->q.qlen++;
 	return err;
 }
@@ -403,6 +401,8 @@
 			skb = qdisc_dequeue_peeked(cl->qdisc);
 			if (cl->qdisc->q.qlen == 0)
 				list_del(&cl->alist);
+
+			bstats_update(&cl->bstats, skb);
 			qdisc_bstats_update(sch, skb);
 			sch->q.qlen--;
 			return skb;