[XFRM]: Convert xfrm_state hash linkage to hlists.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index dd3b84b..3405e5d 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -94,9 +94,9 @@
 struct xfrm_state
 {
 	/* Note: bydst is re-used during gc */
-	struct list_head	bydst;
-	struct list_head	bysrc;
-	struct list_head	byspi;
+	struct hlist_node	bydst;
+	struct hlist_node	bysrc;
+	struct hlist_node	byspi;
 
 	atomic_t		refcnt;
 	spinlock_t		lock;