net: ieee802154: remove explicit set skb->sk

Explicit set skb->sk is needless, sock_alloc_send_skb is already set it.
Signed-off-by: NLin Zhang <xiaolou4617@gmail.com>
Acked-by: NStefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/ieee802154/socket.c

@@ -301,7 +301,6 @@ static int raw_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 		goto out_skb;
 
 	skb->dev = dev;
-	skb->sk  = sk;
 	skb->protocol = htons(ETH_P_IEEE802154);
 
 	dev_put(dev);
@@ -690,7 +689,6 @@ static int dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
 		goto out_skb;
 
 	skb->dev = dev;
-	skb->sk  = sk;
 	skb->protocol = htons(ETH_P_IEEE802154);
 
 	dev_put(dev);