[issue45767] Fix types for dev_t processing in posix module

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Is device number -1 used in any context (for example as "unknown device number")?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45767>
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