new helper: memcpy_from_msg()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
index e1aad6e..63aa5c8 100644
--- a/net/netlink/af_netlink.c
+++ b/net/netlink/af_netlink.c
@@ -2325,7 +2325,7 @@
 	NETLINK_CB(skb).flags	= netlink_skb_flags;
 
 	err = -EFAULT;
-	if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
+	if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
 		kfree_skb(skb);
 		goto out;
 	}