new helper: memcpy_to_msg()

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

net/irda/af_irda.c

@@ -1466,7 +1466,7 @@ static int irda_recvmsg_stream(struct kiocb *iocb, struct socket *sock,
 		}
 
 		chunk = min_t(unsigned int, skb->len, size);
-		if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
+		if (memcpy_to_msg(msg, skb->data, chunk)) {
 			skb_queue_head(&sk->sk_receive_queue, skb);
 			if (copied == 0)
 				copied = -EFAULT;