[mythtv] Minor fixes to mythlcdprocclient.cpp

[Dan Wilga]

For the nearly two years I've been running Myth with my current 
machine, the VFD has been prone to displaying garbage. It only 
happens once every week or two of uptime, however, so it's impossible 
to track down.

Once it starts displaying garbage, the only way to fix it is to 
restart the LCDproc daemon. Restarting mythlcdserver doesn't help, so 
that is why I suspect either some sort of buffer overflow in LCDproc 
or a dropped frame in the parallel port data transfer.
-- 
Dan Wilga                                                        "Ook."