ppp: remove some pointless conditionals before kfree_skb()

Remove some pointless conditionals before kfree_skb().
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ppp_async.c

@@ -233,11 +233,9 @@ ppp_asynctty_close(struct tty_struct *tty)
 	tasklet_kill(&ap->tsk);
 
 	ppp_unregister_channel(&ap->chan);
-	if (ap->rpkt)
-		kfree_skb(ap->rpkt);
+	kfree_skb(ap->rpkt);
 	skb_queue_purge(&ap->rqueue);
-	if (ap->tpkt)
-		kfree_skb(ap->tpkt);
+	kfree_skb(ap->tpkt);
 	kfree(ap);
 }
 

drivers/net/ppp_generic.c

@@ -1245,8 +1245,7 @@ ppp_send_frame(struct ppp *ppp, struct sk_buff *skb)
 	return;
 
  drop:
-	if (skb)
-		kfree_skb(skb);
+	kfree_skb(skb);
 	++ppp->dev->stats.tx_errors;
 }
 
@@ -2658,8 +2657,7 @@ static void ppp_destroy_interface(struct ppp *ppp)
 	ppp->active_filter = NULL;
 #endif /* CONFIG_PPP_FILTER */
 
-	if (ppp->xmit_pending)
-		kfree_skb(ppp->xmit_pending);
+	kfree_skb(ppp->xmit_pending);
 
 	free_netdev(ppp->dev);
 }

drivers/net/ppp_synctty.c

@@ -281,8 +281,7 @@ ppp_sync_close(struct tty_struct *tty)
 
 	ppp_unregister_channel(&ap->chan);
 	skb_queue_purge(&ap->rqueue);
-	if (ap->tpkt)
-		kfree_skb(ap->tpkt);
+	kfree_skb(ap->tpkt);
 	kfree(ap);
 }