net: qrtr: Simplify 'qrtr_tun_release()'

Use 'skb_queue_purge()' instead of re-implementing it.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/qrtr/tun.c

@@ -111,15 +111,11 @@ static __poll_t qrtr_tun_poll(struct file *filp, poll_table *wait)
 static int qrtr_tun_release(struct inode *inode, struct file *filp)
 {
 	struct qrtr_tun *tun = filp->private_data;
-	struct sk_buff *skb;
 
 	qrtr_endpoint_unregister(&tun->ep);
 
 	/* Discard all SKBs */
-	while (!skb_queue_empty(&tun->queue)) {
-		skb = skb_dequeue(&tun->queue);
-		kfree_skb(skb);
-	}
+	skb_queue_purge(&tun->queue);
 
 	kfree(tun);