[Issue 14097] root/async.c: use after free

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14097

--- Comment #6 from Ketmar Dark <ketmar at ketmar.no-ip.org> ---
yet it is perfectly safe to access `aw->files` there, 'cause we will *never*
access it after it's last item processed.

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