[PKT_SCHED]: Remove useless noop_qdisc assignments in destroy functions

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@redhat.com>

net/sched/sch_dsmark.c

@@ -383,7 +383,6 @@ static void dsmark_destroy(struct Qdisc *sch)
 		tcf_destroy(tp);
 	}
 	qdisc_destroy(p->q);
-	p->q = &noop_qdisc;
 	kfree(p->mask);
 }
 

net/sched/sch_netem.c

@@ -812,9 +812,7 @@ static void netem_destroy(struct Qdisc *sch)
 	struct netem_sched_data *q = (struct netem_sched_data *)sch->data;
 
 	del_timer_sync(&q->timer);
-
 	qdisc_destroy(q->qdisc);
-	q->qdisc = &noop_qdisc;
 }
 
 static int netem_dump(struct Qdisc *sch, struct sk_buff *skb)

net/sched/sch_prio.c

@@ -208,10 +208,8 @@ prio_destroy(struct Qdisc* sch)
 		tcf_destroy(tp);
 	}
 
-	for (prio=0; prio<q->bands; prio++) {
+	for (prio=0; prio<q->bands; prio++)
 		qdisc_destroy(q->queues[prio]);
-		q->queues[prio] = &noop_qdisc;
-	}
 }
 
 static int prio_tune(struct Qdisc *sch, struct rtattr *opt)

net/sched/sch_red.c

@@ -434,10 +434,6 @@ static int red_dump(struct Qdisc *sch, struct sk_buff *skb)
 	return -1;
 }
 
-static void red_destroy(struct Qdisc *sch)
-{
-}
-
 static struct Qdisc_ops red_qdisc_ops = {
 	.next		=	NULL,
 	.cl_ops		=	NULL,
@@ -449,7 +445,6 @@ static struct Qdisc_ops red_qdisc_ops = {
 	.drop		=	red_drop,
 	.init		=	red_init,
 	.reset		=	red_reset,
-	.destroy	=	red_destroy,
 	.change		=	red_change,
 	.dump		=	red_dump,
 	.owner		=	THIS_MODULE,

net/sched/sch_tbf.c

@@ -393,7 +393,6 @@ static void tbf_destroy(struct Qdisc *sch)
 		qdisc_put_rtab(q->R_tab);
 
 	qdisc_destroy(q->qdisc);
-	q->qdisc = &noop_qdisc;
 }
 
 static int tbf_dump(struct Qdisc *sch, struct sk_buff *skb)