iucv: Fix missing msg_namelen update in iucv_sock_recvmsg()

The current code does not fill the msg_name member in case it is set.
It also does not set the msg_namelen member to 0 and therefore makes
net/socket.c leak the local, uninitialized sockaddr_storage variable
to userland -- 128 bytes of kernel stack memory.

Fix that by simply setting msg_namelen to 0 as obviously nobody cared
about iucv_sock_recvmsg() not filling the msg_name in case it was set.

Cc: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
static void __exit afiucv_exit(void)
{
	if (pr_iucv) {
		device_unregister(af_iucv_dev);
		driver_unregister(&af_iucv_driver);
		pr_iucv->iucv_unregister(&af_iucv_handler, 0);
		symbol_put(iucv_if);
	} else
		unregister_netdevice_notifier(&afiucv_netdev_notifier);
	dev_remove_pack(&iucv_packet_type);
	sock_unregister(PF_IUCV);
	proto_unregister(&iucv_proto);
}

static void __exit afiucv_exit(void)
{
	if (pr_iucv) {
		device_unregister(af_iucv_dev);
		driver_unregister(&af_iucv_driver);
		pr_iucv->iucv_unregister(&af_iucv_handler, 0);
		symbol_put(iucv_if);
	} else
		unregister_netdevice_notifier(&afiucv_netdev_notifier);
	dev_remove_pack(&iucv_packet_type);
	sock_unregister(PF_IUCV);
	proto_unregister(&iucv_proto);
}
