xfrm: Pass name as const to xfrm_*_get_byname().

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index b43c1b1..673698d 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -234,7 +234,7 @@
 }
 
 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
-			   struct xfrm_algo_desc *(*get_byname)(char *, int),
+			   struct xfrm_algo_desc *(*get_byname)(const char *, int),
 			   struct nlattr *rta)
 {
 	struct xfrm_algo *p, *ualg;