[mythtv] Patch to dvbrecorder.cpp

[Taylor Jacob]

> See the attached email, I previously sent it to myth-users. Perhaps
> the wrong mailing list (I got no responses), so I have attached it
> here.

There were some conditions I believe where Tune() would not return false when it
failed tuning.. I THINK i fixed this in my code (looking at a day or two now..
Had to fix the dvbstatusmonitor first since it was a nice segfault source
whenever it was used)..