[issue45767] Fix types for dev_t processing in posix module

[Dmitry Marakasov]

Dmitry Marakasov <amdmi3 at amdmi3.ru> added the comment:

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

Yes, there's NODEV macro in both Linux and FreeBSD which expands to ((dev_t)-1).

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<https://bugs.python.org/issue45767>
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