[NETNS]: Add netns to nl_info structure.

nl_info is used to track the end-user destination of routing change
notification. This is a natural object to hold a namespace on. Place
it there and utilize the context in the appropriate places.

Acked-by: Benjamin Thery <benjamin.thery@bull.net>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/ipv6/ip6_fib.c

@@ -1314,7 +1314,9 @@ static int fib6_walk(struct fib6_walker_t *w)
 
 static int fib6_clean_node(struct fib6_walker_t *w)
 {
-	struct nl_info info = {};
+	struct nl_info info = {
+		.nl_net = &init_net,
+	};
 	int res;
 	struct rt6_info *rt;
 	struct fib6_cleaner_t *c = container_of(w, struct fib6_cleaner_t, w);