tokio::fs::File::from_std() assumes current file position is zero

[allada]

Version
1.36.0

Platform
Any

Description
tokio::fs::File::from_std() assumes the file being passed in's position is zero even if the StdFile has a different seek position.

This can cause AsyncSeek<File>::poll_complete() to return the wrong file position which causes wrong behavior when using .seek().

See:
https://docs.rs/tokio/latest/src/tokio/fs/file.rs.html#242