of_changeset_add_property
ret = of_changeset_add_property(ocs, np, new_pp);
ret = of_changeset_add_property(&ovcs->cset, target->np,
unittest(!of_changeset_add_property(&chgset, n1, ppname_n1), "fail add prop name\n");
unittest(!of_changeset_add_property(&chgset, n2, ppname_n2), "fail add prop name\n");
unittest(!of_changeset_add_property(&chgset, n21, ppname_n21), "fail add prop name\n");
unittest(!of_changeset_add_property(&chgset, parent, ppadd), "fail add prop prop-add\n");