[Patch-gnuradio] audio_alsa_source.cc: Check pcm state before messing with hw_params

[Alexandru Csete]

Greetings,

If a C++ flowgraph containing an audio source (ALSA) is reconfigured
during runtime, the application will crash with:

audio_alsa_source[hw:1]: 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=2
Aborted

Some time ago the same problem has been fixed for the audio_alsa_sink
and the attached patch contains the very same fix for the
audio_alsa_source.

Alex

0001-Check-pcm-state-before-messing-with-hw_params-preven.patch
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