[IPv6]: Use rtnl registration interface

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 7b917f8..82572b5 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -945,6 +945,8 @@
 {
 	/* First of all disallow new sockets creation. */
 	sock_unregister(PF_INET6);
+	/* Disallow any further netlink messages */
+	rtnl_unregister_all(PF_INET6);
 
 	/* Cleanup code parts. */
 	ipv6_packet_cleanup();