for_each_commit_graft(): mark unused callback parameter

The for_each_commit_graft() functions takes a callback, but not every
callback uses the void data parameter. Mark the unused one to appease
the -Wunused-parameter warning.

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

Author: peff

log-tree.c

@@ -196,7 +196,8 @@ static int add_ref_decoration(const char *refname, const struct object_id *oid,
 	return 0;
 }
 
-static int add_graft_decoration(const struct commit_graft *graft, void *cb_data)
+static int add_graft_decoration(const struct commit_graft *graft,
+				void *cb_data UNUSED)
 {
 	struct commit *commit = lookup_commit(the_repository, &graft->oid);
 	if (!commit)