[Patch-gnuradio] Small patch for audio_alsa_source

[Volker Schroer]

Changing the topology of a flow graph with a valve leads to runtime erros

Uaudio_alsa_source[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_source(2) using 
ninputs=0, noutputs=1



This can be avoided by the attached patch.

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

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

Volker

audio_alsa_source.diff
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