[issue42053] fwalk: incorrect boolean test for non-fd arguments

[Hasan]

Change by Hasan <hasan.aleeyev at gmail.com>:


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pull_requests: +26039
pull_request: https://github.com/python/cpython/pull/27524

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42053>
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