[issue38402] crypt: check error from library call

[Antonio Gutierrez]

Change by Antonio Gutierrez <chibby0ne at gmail.com>:


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keywords: +patch
pull_requests: +16224
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/16599

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38402>
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