commit: add short-circuit to paint_down_to_common()

diff --git a/builtin/diff.c b/builtin/diff.c
index 9808d062a80a2ff07699fb0ea4cbd29f560630d3..bfefff3a84896a79fbed42eec1121286edcc86dd 100644 (file)
--- a/builtin/diff.c
+++ b/builtin/diff.c
@@ -379,7 +379,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
                                add_head_to_pending(&rev);
                                if (!rev.pending.nr) {
                                        struct tree *tree;
-                                       tree = lookup_tree(&empty_tree_oid);
+                                       tree = lookup_tree(the_hash_algo->empty_tree);
                                        add_pending_object(&rev, &tree->object, "HEAD");
                                }
                                break;
@@ -398,7 +398,7 @@ int cmd_diff(int argc, const char **argv, const char *prefix)
                if (!obj)
                        die(_("invalid object '%s' given."), name);
                if (obj->type == OBJ_COMMIT)
-                       obj = &((struct commit *)obj)->tree->object;
+                       obj = &get_commit_tree(((struct commit *)obj))->object;
 
                if (obj->type == OBJ_TREE) {
                        obj->flags |= flags;