[issue41839] Fix error checking in sched_get_priority_ functions

[Jakub Kulik]

Change by Jakub Kulik <kulikjak at gmail.com>:


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keywords: +patch
pull_requests: +21413
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/22374

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<https://bugs.python.org/issue41839>
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