if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
ret, ftdi_get_error_string(devc->ftdic));
goto err_open_close_ftdic;
}
if ((ret = ftdi_usb_purge_buffers(devc->ftdic)) < 0) {
sr_err("Failed to purge FTDI RX/TX buffers (%d): %s.",
ret, ftdi_get_error_string(devc->ftdic));
goto err_open_close_ftdic;
}