[NETNS]: Re-export init_net via EXPORT_SYMBOL.

init_net is used added as a parameter to a lot of old API calls, f.e.
ip_dev_find. These calls were exported as EXPORT_SYMBOL. So, export init_net
as EXPORT_SYMBOL to keep networking API consistent.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/core/net_namespace.c

@@ -18,7 +18,7 @@ static DEFINE_MUTEX(net_mutex);
 LIST_HEAD(net_namespace_list);
 
 struct net init_net;
-EXPORT_SYMBOL_GPL(init_net);
+EXPORT_SYMBOL(init_net);
 
 /*
  * setup_net runs the initializers for the network namespace object.