[mythtv] Quick Jack fix for 0.23

[Ed W]

Hi, I just checked out the latest git 
(git://git.jannau.net/mythtv.complete) on the 0.23 branch and noticed 
that the Jack code was accidently broken by commit: 
454d47c184cf55460f9e7a89f6373a274b0e13f3 (git-svn-id: 
http://svn.mythtv.org/svn/trunk@22432 7dbf422c-18fa-0310-86e9-fd20926502f2)

The patch attached should fix things.  Essentially there is a double 
free because you should only call the JACK_Close call if the open succeeded.

Grateful if someone could slip this in before the 0.23 release since 
it's otherwise a show stopper for myself and the other jack user...

Thanks

Ed W


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