return; /* we are done */
                else {
                        /* cannot resolve yet --- queue it */
-                       hashcpy(obj_list[nr].sha1, null_sha1);
+                       hashclr(obj_list[nr].sha1);
                        add_delta_to_list(nr, base_sha1, 0, delta_data, delta_size);
                        return;
                }
                         * The delta base object is itself a delta that
                         * has not been resolved yet.
                         */
-                       hashcpy(obj_list[nr].sha1, null_sha1);
+                       hashclr(obj_list[nr].sha1);
                        add_delta_to_list(nr, null_sha1, base_offset, delta_data, delta_size);
                        return;
                }