[Patch-gnuradio] Small patch for audio_alsa_sink

[Volker Schroer]

Switching parts of a flow graph with a valve leads to runtime erros

audio_alsa_sink[hw:0,0]: snd_pcm_hw_params failed: File descriptor in 
bad state
terminate called after throwing an instance of 'std::runtime_error'
   what():  check topology failed on audio_alsa_sink(1) using 
ninputs=1, noutputs=0


This can be avoided by the attached patch.

Depending on the state of stream the parameters are not again set or the 
stream will be restarted.

So you can even stop and restart the sound output without runtime errors.

Volker

audio_alsa_sink.diff
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