Jacob Dahl 1aad8b6ec9
serial: nuttx: revert tcdrain back to fsync (#25538)
* serial: nuttx: revert tcdrain back to fsync

* serial: do not print error on EAGAIN

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Co-authored-by: Alexander Lerach <alexander@auterion.com>
2025-09-11 12:32:34 -08:00
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