USBVC_BUF_ERR
(bufgrp->buf_filling->status == USBVC_BUF_ERR ||
buf_filling->status = USBVC_BUF_ERR;
buf_filling->status = USBVC_BUF_ERR;
buf_filling->status = USBVC_BUF_ERR;
case USBVC_BUF_ERR: