Properly close microphone before malgo chunk channel

[edaniels]

Prior to this, there's a chance you would close the chunk channel while malgo is trying to send on it. Instead, it's better to stop the malgo device and then close. That also means we need to discard chunks when trying to stop due to the buffered channel.

[edaniels]

@at-wat updated. I left the intentional close in to not rely on an GC implementation detail

[codecov[bot]]

Codecov Report

Merging #436 (dcaf53c) into master (5215057) will not change coverage. The diff coverage is n/a.

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##           master     #436   +/-   ##
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  Coverage   47.32%   47.32%           
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  Files          67       67           
  Lines        4463     4463           
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  Hits         2112     2112           
  Misses       2226     2226           
  Partials      125      125           

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