[MPlayer-dev-eng] [PATCH] fix a v4l2 uninit crash

[Aurelien Jacobs]

Hi,

The following patch to tvi_v4l2 ensure that pthread_join is only called
when a thread was really created. This fixes a crash for me when I don't
specify -tv noaudio=yes and that there is still no audio device opened.

I will commit this soon as it's trivial and safe.

Aurel
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