MBOX_NO_MSG
if (chan->active_req != MBOX_NO_MSG && chan->cl) {
if (!chan || !chan->cl || mssg == MBOX_NO_MSG)
chan->active_req = MBOX_NO_MSG;
chan->active_req = MBOX_NO_MSG;
if (!chan->msg_count || chan->active_req != MBOX_NO_MSG)
chan->active_req = MBOX_NO_MSG;
chan->active_req = MBOX_NO_MSG;
if (mssg == MBOX_NO_MSG)
if (chan->active_req != MBOX_NO_MSG)