[mythtv] MythMusic CDdecoder crash

[Nigel Pearson]

> it looks like more than one thread
> was using the same QString value without mutex
> protection. When you pass a string between
> threads you need to assign it using QDeepCopy.

That was my first thought, too, but a look at
the existing (Linux) cddecoder.cpp revealed no
implicit non-shared QStrings or copies thereof.


I have started adding QDeepCopy <QString> anyway,
but there is no change to the crashes yet.

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