[issue38425] Remove warning: ‘res’ may be used uninitialized in this function

[Dong-hee Na]

Change by Dong-hee Na <donghee.na92 at gmail.com>:


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stage: patch review -> 
versions: +Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38425>
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