zr->members = xcalloc (zr->n_members, sizeof (*zr->members));
memset (zr->members, 0, zr->n_members * sizeof (*zr->members));
zr->members = xcalloc (zr->n_members, sizeof (*zr->members));
memset (zr->members, 0, zr->n_members * sizeof (*zr->members));