symfony/symfony — pull request #8202 by Tobion (2013-06-05 08:21:00+00:00)
Title: [Console] fix status and exit code

Fix https://github.com/symfony/symfony/pull/8183#discussion_r4525267
and
http://www.php.net/manual/en/function.exit.php
> Exit statuses should be in the range 0 to 254, the exit status 255 is reserved by PHP and shall not be used. The status 0 is used to terminate the program successfully.