Backport rev 69010 from the 1.4 branch ...

In ast_channel_make_compatible(), just return if the channels' read and write
formats already match up.  There are code paths that call this function on a
pair of channels multiple times.  This made calls fail that were using g729
in some cases.  The reason is that codec_g729a will unregister itself from the
list of available translators will all licenses are in use.  So, the first
time the function got called, the right translation path was allocated.
However, the second time it got called, the code would not find a translation
path to/from g729 and make the call fail, even if the channel actually already
had a g729 translation path allocated.

(SPD-32)


git-svn-id: http://svn.digium.com/svn/asterisk/branches/1.2@69347 f38db490-d61c-443f-a65b-d21fe96a405b

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