[NET_SCHED]: Unline tcf_destroy

Uninline tcf_destroy and add a helper function to destroy an entire filter
chain.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/sch_prio.c b/net/sched/sch_prio.c
index f139963..5cfe60b 100644
--- a/net/sched/sch_prio.c
+++ b/net/sched/sch_prio.c
@@ -189,13 +189,8 @@
 {
 	int prio;
 	struct prio_sched_data *q = qdisc_priv(sch);
-	struct tcf_proto *tp;
 
-	while ((tp = q->filter_list) != NULL) {
-		q->filter_list = tp->next;
-		tcf_destroy(tp);
-	}
-
+	tcf_destroy_chain(q->filter_list);
 	for (prio=0; prio<q->bands; prio++)
 		qdisc_destroy(q->queues[prio]);
 }