False packetDataChecksum disagree

Minor nitpick, but something that confused me as a beginer in the net code.

When the client first connects a few "packetDataChecksum disagree!" messages are generated which to a newbie make you think you've somehow broken the netcode. The truth is that on startup the checksum sent from the client can be 0 for a few updates.

I suggest the code is changed to avoid these false errors/warnings:

if(bstream->writeFlag(mControlObject->getPacketDataChecksum(this) != LastControlObjectChecksum))
   {
#ifdef TORQUE_DEBUG_NET
      if ( LastControlObjectChecksum != 0 )
         Con::printf("packetDataChecksum disagree!");
#endif