Merge "Check ch_id in UIPC_Read before using it"

uint32_t UIPC_Read(tUIPC_STATE& uipc, tUIPC_CH_ID ch_id,

                   UNUSED_ATTR uint16_t* p_msg_evt, uint8_t* p_buf,

                   uint32_t len) {

  int n_read = 0;

  int fd = uipc.ch[ch_id].fd;

  struct pollfd pfd;

  if (ch_id >= UIPC_CH_NUM) {

    BTIF_TRACE_ERROR("UIPC_Read : invalid ch id %d", ch_id);

    return 0;

  }

  int n_read = 0;

  int fd = uipc.ch[ch_id].fd;

  struct pollfd pfd;

  if (fd == UIPC_DISCONNECTED) {

    BTIF_TRACE_ERROR("UIPC_Read : channel %d closed", ch_id);

    return 0;