[NETNS]: Add a namespace mark to fib_info.

This is required to make fib_info lookups namespace aware. In the
other case initial namespace devices are marked as dead in the local
routing table during other namespace stop.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index 1b2f008..cb0df37 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -69,6 +69,7 @@
 struct fib_info {
 	struct hlist_node	fib_hash;
 	struct hlist_node	fib_lhash;
+	struct net		*fib_net;
 	int			fib_treeref;
 	atomic_t		fib_clntref;
 	int			fib_dead;