[PATCH v3 net 3/5] vxlan: fix crash on module removal

If vxlan is removed with active vxlan's it would crash because
rtnl_link_unregister (which calls vxlan_dellink), was invoked
before unregister_pernet_device (which calls vxlan_stop).

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
v3 - get rid of destroy_workqueue that snuck in from later patch

Should go to stable as well

--- a/drivers/net/vxlan.c	2013-06-10 15:06:15.186973784 -0700
+++ b/drivers/net/vxlan.c	2013-06-10 15:10:11.603785773 -0700

@@ -1785,8 +1785,8 @@ late_initcall(vxlan_init_module);
 
 static void __exit vxlan_cleanup_module(void)
 {
-	rtnl_link_unregister(&vxlan_link_ops);
 	unregister_pernet_device(&vxlan_net_ops);
+	rtnl_link_unregister(&vxlan_link_ops);
 	rcu_barrier();
 }
 module_exit(vxlan_cleanup_module);