netlink: remove some pointless conditionals before kfree_skb()

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

net/netlink/af_netlink.c

@@ -1049,8 +1049,7 @@ int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 pid,
 
 	netlink_unlock_table();
 
-	if (info.skb2)
-		kfree_skb(info.skb2);
+	kfree_skb(info.skb2);
 
 	if (info.delivery_failure)
 		return -ENOBUFS;
@@ -1542,8 +1541,7 @@ EXPORT_SYMBOL(netlink_set_nonroot);
 
 static void netlink_destroy_callback(struct netlink_callback *cb)
 {
-	if (cb->skb)
-		kfree_skb(cb->skb);
+	kfree_skb(cb->skb);
 	kfree(cb);
 }