can: raw: raw_sendmsg(): remove not needed setting of skb->sk

The skb in raw_sendmsg() is allocated with sock_alloc_send_skb(),
which subsequently calls sock_alloc_send_pskb() -> skb_set_owner_w(),
which assigns "skb->sk = sk".

This patch removes the not needed setting of skb->sk.

Link: https://lore.kernel.org/all/[e-mail]
Acked-by: Oliver Hartkopp <[e-mail]>
Signed-off-by: Marc Kleine-Budde <[e-mail]>

net/can/raw.c

···
 	skb_setup_tx_timestamp(skb, sk->sk_tsflags);
 
 	skb->dev = dev;
-	skb->sk = sk;
 	skb->priority = sk->sk_priority;
 
 	err = can_send(skb, ro->loopback);