[DCCP]: dccp_v(4|6)_ctl_socket is leaked.

This seems a purism as module can't be unloaded, but though if cleanup
method is present it should be correct and clean all staff created.

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>

net/dccp/ipv4.c

@@ -1020,6 +1020,7 @@ out_proto_unregister:
 
 static void __exit dccp_v4_exit(void)
 {
+	sock_release(dccp_v4_ctl_sk->sk_socket);
 	inet_unregister_protosw(&dccp_v4_protosw);
 	inet_del_protocol(&dccp_v4_protocol, IPPROTO_DCCP);
 	proto_unregister(&dccp_v4_prot);

net/dccp/ipv6.c

@@ -1202,6 +1202,7 @@ out_unregister_proto:
 
 static void __exit dccp_v6_exit(void)
 {
+	sock_release(dccp_v6_ctl_sk->sk_socket);
 	inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
 	inet6_unregister_protosw(&dccp_v6_protosw);
 	proto_unregister(&dccp_v6_prot);