new helper: memcpy_from_msg()

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

net/ipv4/ping.c

@@ -660,7 +660,7 @@ int ping_common_sendmsg(int family, struct msghdr *msg, size_t len,
 	 *	Fetch the ICMP header provided by the userland.
 	 *	iovec is modified! The ICMP header is consumed.
 	 */
-	if (memcpy_fromiovec(user_icmph, msg->msg_iov, icmph_len))
+	if (memcpy_from_msg(user_icmph, msg, icmph_len))
 		return -EFAULT;
 
 	if (family == AF_INET) {