Ignore HHVM errors when closing connection that is already closing #91
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HHVM raises a PHP warning when trying to shut down a socket that is already closing because the other side closed the connection. This does not happen for any other PHP version, so simply ignore this error as part of the shut down procedure.
Refs clue/reactphp-http-proxy#9 and https://travis-ci.org/clue/php-http-proxy-react/jobs/220595506