Fix potential derefernce after NULL check in AudioConfigSettings.

I actually can't see how m_MaxAudioChannels, m_AudioUpmix or
m_AudioUpmixType could ever be NULL, but I think this changee is what
the original author intended.  Fixes Coverity 700422.
Comment out unused variable in AudioConfigSettings.

One less warning.  jya, I only commented out bDTS instead of removing
it entirely in case you have an intended use for it in the future.
Remove unused code in MythCommFlag TemplateFinder.

The condition could never be true, so just remove it.  Fixes Coverity
700285.
Merge remote-tracking branch 'upstream/master'