- when we need to do both AUDIO_SETINFO and AUDIO_GETINFO to emulate

  a single OSS ioctl, return the return value and errno from from
  AUDIO_SETINFO if there was an error, since it's more informative
  than the return value and errno from AUDIO_GETINFO.  also, don't
  bail if AUDIO_SETINFO fails, because OSS ioctls should return the
  current value of the parameter they are setting, even if there was
  an error.

- avoid a possible (though highly unlikely) divide by zero in
  SNDCTL_DSP_GET[IO]SPACE.

ok ratchov@

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