fetch-pack: mark unused parameter in callback function

The for_each_cached_alternate() interface requires a callback that takes
a negotiator parameter, but not all implementations need it. Mark the
unused one as such to appease -Wunused-parameter.

Signed-off-by: Jeff King <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: peff

fetch-pack.c

@@ -722,7 +722,7 @@ static void filter_refs(struct fetch_pack_args *args,
 	*refs = newlist;
 }
 
-static void mark_alternate_complete(struct fetch_negotiator *unused,
+static void mark_alternate_complete(struct fetch_negotiator *negotiator UNUSED,
 				    struct object *obj)
 {
 	mark_complete(&obj->oid);