xfrm: Const'ify address arguments to __xfrm_dst_lookup()

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 4827c8d..5f19ae6 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -92,8 +92,8 @@
 }
 
 static inline struct dst_entry *__xfrm_dst_lookup(struct net *net, int tos,
-						  xfrm_address_t *saddr,
-						  xfrm_address_t *daddr,
+						  const xfrm_address_t *saddr,
+						  const xfrm_address_t *daddr,
 						  int family)
 {
 	struct xfrm_policy_afinfo *afinfo;