tree-diff: don't access hash of NULL object_id pointer

diff --git a/merge-recursive.c b/merge-recursive.c
index ae5238d82ca8c86b99391a0836a0539efe7eacde..5cc86df2d15729e9b0e8b36fdb151d5986f42a10 100644 (file)
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -528,7 +528,7 @@ static struct string_list *get_renames(struct merge_options *o,
        opts.show_rename_progress = o->show_rename_progress;
        opts.output_format = DIFF_FORMAT_NO_OUTPUT;
        diff_setup_done(&opts);
-       diff_tree_sha1(o_tree->object.oid.hash, tree->object.oid.hash, "", &opts);
+       diff_tree_oid(&o_tree->object.oid, &tree->object.oid, "", &opts);
        diffcore_std(&opts);
        if (opts.needed_rename_limit > o->needed_rename_limit)
                o->needed_rename_limit = opts.needed_rename_limit;