[FIB]: Add netns to fib_rules_ops.

The backward link from FIB rules operations to the network namespace
will allow to simplify the API a bit.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/fib_rules.c b/net/ipv4/fib_rules.c
index 72232ab..8d0ebe7 100644
--- a/net/ipv4/fib_rules.c
+++ b/net/ipv4/fib_rules.c
@@ -315,6 +315,8 @@
 	if (ops == NULL)
 		return -ENOMEM;
 	INIT_LIST_HEAD(&ops->rules_list);
+	ops->fro_net = net;
+
 	fib_rules_register(net, ops);
 
 	err = fib_default_rules_init(ops);