cache-tree: use is_empty_tree_oid

diff --git a/unpack-trees.c b/unpack-trees.c
index e73745051e505934b44be216b1d80a6c053c96de..038ef7b92683257f3a47806d91a0dd560549d363 100644 (file)
--- a/unpack-trees.c
+++ b/unpack-trees.c
@@ -1287,7 +1287,7 @@ int unpack_trees(unsigned len, struct tree_desc *t, struct unpack_trees_options
        o->result.split_index = o->src_index->split_index;
        if (o->result.split_index)
                o->result.split_index->refcount++;
-       hashcpy(o->result.sha1, o->src_index->sha1);
+       oidcpy(&o->result.oid, &o->src_index->oid);
        o->merge_size = len;
        mark_all_ce_unused(o->src_index);