tree-walk: convert fill_tree_descriptor() to object_id

All callers of fill_tree_descriptor() have been converted to object_id
already, so convert that function as well.  As a nice side-effect we get
rid of NULL checks in tree-diff.c, as fill_tree_descriptor() already
does them for us.

Helped-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Rene Scharfe <l.s.r@web.de>
Reviewed-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/notes.c b/notes.c
index 503754d79e..f090c88363 100644
--- a/notes.c
+++ b/notes.c
@@ -425,7 +425,7 @@ static void load_subtree(struct notes_tree *t, struct leaf_node *subtree,
 	unsigned char type;
 	struct leaf_node *l;
 
-	buf = fill_tree_descriptor(&desc, subtree->val_oid.hash);
+	buf = fill_tree_descriptor(&desc, &subtree->val_oid);
 	if (!buf)
 		die("Could not read %s for notes-index",
 		     oid_to_hex(&subtree->val_oid));