netns xfrm: per-netns state GC work

State GC is per-netns, and this is part of it.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/netns/xfrm.h b/include/net/netns/xfrm.h
index 8ceb765..8055535 100644
--- a/include/net/netns/xfrm.h
+++ b/include/net/netns/xfrm.h
@@ -21,6 +21,7 @@
 	unsigned int		state_num;
 	struct work_struct	state_hash_work;
 	struct hlist_head	state_gc_list;
+	struct work_struct	state_gc_work;
 };
 
 #endif