CC2530: Z-Stack nwkUpdateId

Hi,

I'm reading the source code for "Z-Stack 3.0.2".
I have a question about how the nwkUpdateId make a round.

nwkUpdateId is incremented.
nwkUpdateId be back from 0xFF to 0.
The following comparison method, I don't think nwkUpdatId will be updated.
Is this okay?
If it's wrong, how should it be fixed?

For example
   uint8 nwkUpdateId;
   (Current)  _NIB.nwkUpdateId = 0xFF
   (Next)     Req.nwkUpdateId = 0xFF+1 = 0

ZDNwkMgr.c

  static void ZDNwkMgr_ProcessMgmtNwkUpdateReq( zdoIncomingMsg_t *inMsg )
  {
    else if ( Req.scanDuration == 0xFE )
    {
xx    if (( Req.nwkUpdateId > _NIB.nwkUpdateId ) && ( Req.channelMask != 0))
      {
        // Set update ID in the Beacon
      }
    }
    else if ( Req.scanDuration == 0xFF )
    {
xx    if (( Req.nwkUpdateId > _NIB.nwkUpdateId ) && ( Req.channelMask != 0))
      {
        // Set update ID in the Beacon
      }
    }