diff-tree: avoid lookup_unknown_object

diff --git a/fetch-pack.c b/fetch-pack.c
index eeee2bb7e08a21dfe091a30c8378da6d488228f5..b12bd4c59a1105f4d3a82bbbd5208e3f7ebae0bb 100644 (file)
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -507,7 +507,7 @@ static void filter_refs(struct fetch_pack_args *args,
                int keep = 0;
                next = ref->next;
 
-               if (!memcmp(ref->name, "refs/", 5) &&
+               if (starts_with(ref->name, "refs/") &&
                    check_refname_format(ref->name, 0))
                        ; /* trash */
                else {