pw_hdlc: fix python example for encode No testing done. Change-Id: Ifdcf117415ca8ced627b934cb683286c26252f9c Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/45300 Reviewed-by: Wyatt Hepler <hepler@google.com> Commit-Queue: Paul Mathieu <paulmathieu@google.com>
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