xfrm: Const'ify pointer args to km_migrate() and implementations.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 7028f06..555bedd 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -1819,9 +1819,9 @@
 EXPORT_SYMBOL(km_policy_expired);
 
 #ifdef CONFIG_XFRM_MIGRATE
-int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
-	       struct xfrm_migrate *m, int num_migrate,
-	       struct xfrm_kmaddress *k)
+int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
+	       const struct xfrm_migrate *m, int num_migrate,
+	       const struct xfrm_kmaddress *k)
 {
 	int err = -EINVAL;
 	int ret;