xfrm: Const'ify local xfrm_address_t pointers in xfrm_policy_lookup_bytype.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 0c503be..d097668 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -894,7 +894,7 @@
 {
 	int err;
 	struct xfrm_policy *pol, *ret;
-	xfrm_address_t *daddr, *saddr;
+	const xfrm_address_t *daddr, *saddr;
 	struct hlist_node *entry;
 	struct hlist_head *chain;
 	u32 priority = ~0U;