t(struct dvb_frontend *fe) {  struct dvb_usb_adapter *adap = fe->dvb->priv;  struct dvb_usb_device *d = adap->dev;  struct mxl000sf_state *state = d->priv;  struct mxl000sf_adap_state *adap_state = adap->fe_adap[fe->id].priv;   int err;   /* exit if we didnt initialize the driver yet */  if (!state->chip_id) {   mxl_debug("driver not yet initialized, exit.");   goto fail;  }   deb_info("%s()\n", __func__);   