[NETNS][DCCPV4]: Move the dccp_v4_ctl_sk on the struct net.

And replace all its usage with init_net's socket.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/netns/dccp.h b/include/net/netns/dccp.h
index 056e6ad..e4f16fa 100644
--- a/include/net/netns/dccp.h
+++ b/include/net/netns/dccp.h
@@ -1,7 +1,10 @@
 #ifndef __NETNS_DCCP_H__
 #define __NETNS_DCCP_H__
 
+struct sock;
+
 struct netns_dccp {
+	struct sock *v4_ctl_sk;
 };
 
 #endif