refactor: unistd::close() does not need to be unsafe
#2495
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What does this PR do
libc::close(2)will returnEBADFwhen there is a double-close, so our Rusty wrapper does not need to be unsafe. I guess my mind was dizzy when I originally modified this interface.Checklist:
I have read
CONTRIBUTING.mdI have written necessary tests and rustdoc comments
A change log has been added if this PR modifies nix's API
No changelog is needed as this change has not been released yet.