pkt_sched: Don't used locked skb_queue_purge() in __qdisc_reset_queue()

We have to have exclusive access to the given qdisc anyways, so
doing even more locking is superfluous.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
index 2902a42..0a158ff 100644
--- a/include/net/sch_generic.h
+++ b/include/net/sch_generic.h
@@ -374,7 +374,7 @@
 	 * We do not know the backlog in bytes of this list, it
 	 * is up to the caller to correct it
 	 */
-	skb_queue_purge(list);
+	__skb_queue_purge(list);
 }
 
 static inline void qdisc_reset_queue(struct Qdisc *sch)