[ot-ctl] fix ot-ctl hang (#6378)
[ot-ctl] fix ot-ctl hang (#6378)


jwhui/openthread,jwhui/openthread,abtink/openthread,openthread/openthread,abtink/openthread,srickardti/openthread,abtink/openthread,srickardti/openthread,openthread/openthread,srickardti/openthread,jwhui/openthread,jwhui/openthread,srickardti/openthread,abtink/openthread,openthread/openthread,openthread/openthread