[mythtv] 0.21-fixes SVN17722 mem leaks report

[Nigel Pearson]

> For checking this, I prepared set of scripts simulating usage of  
> main myth functions like LiveTV, play rec, play video, read news,  
> check system stats, etc.
> Below are FYI results of my tests.

Piotro, thanks for that testing.

How were the functions invoked?

Telnet interface? Media insertion/removal?

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