virstor_geom_destroy
static int virstor_geom_destroy(struct g_virstor_softc *, boolean_t,
virstor_geom_destroy(sc, TRUE, FALSE);
virstor_geom_destroy(sc, TRUE, FALSE);
if ((error = virstor_geom_destroy(sc, TRUE, TRUE)) != 0) {
virstor_geom_destroy(sc, FALSE, FALSE);
virstor_geom_destroy(sc, TRUE, FALSE);