iucv: 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>

net/iucv/af_iucv.c

@@ -1171,8 +1171,7 @@ static void iucv_callback_txdone(struct iucv_path *path,
 
 		spin_unlock_irqrestore(&list->lock, flags);
 
-		if (this)
-			kfree_skb(this);
+		kfree_skb(this);
 	}
 	BUG_ON(!this);