new helper: memcpy_from_msg()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/net/phonet/datagram.c b/net/phonet/datagram.c
index 0918bc21..26054b4 100644
--- a/net/phonet/datagram.c
+++ b/net/phonet/datagram.c
@@ -109,7 +109,7 @@
 		return err;
 	skb_reserve(skb, MAX_PHONET_HEADER);
 
-	err = memcpy_fromiovec((void *)skb_put(skb, len), msg->msg_iov, len);
+	err = memcpy_from_msg((void *)skb_put(skb, len), msg, len);
 	if (err < 0) {
 		kfree_skb(skb);
 		return err;