ipv6: ip6mr: move mroute data into seperate structure

Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/include/linux/mroute6.h b/include/linux/mroute6.h
index 94a0cb5..0370dd4 100644
--- a/include/linux/mroute6.h
+++ b/include/linux/mroute6.h
@@ -229,10 +229,7 @@
 			   struct rtmsg *rtm, int nowait);
 
 #ifdef CONFIG_IPV6_MROUTE
-static inline struct sock *mroute6_socket(struct net *net)
-{
-	return net->ipv6.mroute6_sk;
-}
+extern struct sock *mroute6_socket(struct net *net);
 extern int ip6mr_sk_done(struct sock *sk);
 #else
 static inline struct sock *mroute6_socket(struct net *net) { return NULL; }