[NETNS]: Inet control socket should not hold a namespace.

This is a generic requirement, so make inet_ctl_sock_create namespace
aware and create a inet_ctl_sock_destroy wrapper around
sk_release_kernel.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 5669c89..b12803b 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -1003,7 +1003,7 @@
 	inet_register_protosw(&dccp_v4_protosw);
 
 	err = inet_ctl_sock_create(&dccp_v4_ctl_sk, PF_INET,
-				   SOCK_DCCP, IPPROTO_DCCP);
+				   SOCK_DCCP, IPPROTO_DCCP, &init_net);
 	if (err)
 		goto out_unregister_protosw;
 out:
@@ -1018,7 +1018,7 @@
 
 static void __exit dccp_v4_exit(void)
 {
-	sock_release(dccp_v4_ctl_sk->sk_socket);
+	inet_ctl_sock_destroy(dccp_v4_ctl_sk);
 	inet_unregister_protosw(&dccp_v4_protosw);
 	inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP);
 	proto_unregister(&dccp_v4_prot);