IDPF_VC_XN_SHUTDOWN
if (xn->state != IDPF_VC_XN_SHUTDOWN)
xn->state = IDPF_VC_XN_SHUTDOWN;
if (xn->state == IDPF_VC_XN_SHUTDOWN) {
case IDPF_VC_XN_SHUTDOWN:
case IDPF_VC_XN_SHUTDOWN: