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>
diff --git a/drivers/net/ppp_generic.c b/drivers/net/ppp_generic.c
index ea8cdf8..42d4555 100644
--- a/drivers/net/ppp_generic.c
+++ b/drivers/net/ppp_generic.c
@@ -1245,8 +1245,7 @@
 	return;
 
  drop:
-	if (skb)
-		kfree_skb(skb);
+	kfree_skb(skb);
 	++ppp->dev->stats.tx_errors;
 }
 
@@ -2658,8 +2657,7 @@
 	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);
 }