Comment # 9 on bug 108889 from Chris Wilson

commit 520b6f7fbb6cb7dc99d689cc6c073fae1ccc8e7f
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri Mar 15 23:00:33 2019 +0000

    sw_sync: Wait until the end

    If we allow a fork-helper to exit normally before the parent tries to
    reap the helper (fork-helpers are intended to be only used for
    persistent background loads), then the helper unhelpful aborts because
    the child exited cleanly.

    Simplify by not using the so called helpers at all.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108889
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

Accidentally pushed, but worksforme so I hope no one notices.