new helper: memcpy_from_msg()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

net/netrom/af_netrom.c

@@ -1113,7 +1113,7 @@ static int nr_sendmsg(struct kiocb *iocb, struct socket *sock,
 	skb_put(skb, len);
 
 	/* User data follows immediately after the NET/ROM transport header */
-	if (memcpy_fromiovec(skb_transport_header(skb), msg->msg_iov, len)) {
+	if (memcpy_from_msg(skb_transport_header(skb), msg, len)) {
 		kfree_skb(skb);
 		err = -EFAULT;
 		goto out;