packet: propagate sock_cmsg_send() error

sock_cmsg_send() can return different error codes and not only
-EINVAL, and we should properly propagate them.

Fixes: c14ac94 ("sock: enable timestamping using control messages")
Signed-off-by: Soheil Hassas Yeganeh <[email protected]>
Cc: Willem de Bruijn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: soheilhy

net/packet/af_packet.c

@@ -1930,10 +1930,8 @@ static int packet_sendmsg_spkt(struct socket *sock, struct msghdr *msg,
 	sockc.tsflags = sk->sk_tsflags;
 	if (msg->msg_controllen) {
 		err = sock_cmsg_send(sk, msg, &sockc);
-		if (unlikely(err)) {
-			err = -EINVAL;
+		if (unlikely(err))
 			goto out_unlock;
-		}
 	}
 
 	skb->protocol = proto;