os.truncate() ignores _chsize_s() errors on Windows #159630

Bug report

_chsize_s() returns 0 on success and a positive errno value on failure according to MS's document: https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/chsize-s?view=msvc-170#return-value, but the code checks result < 0, so failures are silently ignored.

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

Linked PRs

• gh-159630: Fix os.truncate() not raising OSError on Windows when truncation fails #159632