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d6606bcfff
If no-block was given, the device would be opened with SND_PCM_NOBLOCK. Also, after opening, blocking mode was unconditionally enabled anyway with snd_pcm_nonblock(). Further, if opening with SND_PCM_NOBLOCK failed, opening was retried without this flag. This doesn't make any sense to me, and I've never heard of someone using this suboption. I suspect it has to do with ancient ALSA bugs or API caveats. Remove it and simplify the code.