NETFRONT: Use __skb_queue_purge()

Use standard routine for queue purging.

Signed-off-by: Wang Chen <wangchen@cn.fujitsu.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index 8bddff1..d26f69b 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -946,8 +946,7 @@
 		work_done++;
 	}
 
-	while ((skb = __skb_dequeue(&errq)))
-		kfree_skb(skb);
+	__skb_queue_purge(&errq);
 
 	work_done -= handle_incoming_queue(dev, &rxq);
 
@@ -1079,8 +1078,7 @@
 		}
 	}
 
-	while ((skb = __skb_dequeue(&free_list)) != NULL)
-		dev_kfree_skb(skb);
+	__skb_queue_purge(&free_list);
 
 	spin_unlock_bh(&np->rx_lock);
 }