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dt_unring_buf: set dtbd_oldest to the start of the first record

Description

dt_unring_buf: set dtbd_oldest to the start of the first record

It was set to the start of the buffer and that can be different from the
start of teh first record because of a misalignment.

This change follows the example of dt_realloc_buf().

(cherry picked from commit 256c8c5df2a4bdd43afd9ec5a2f8be9374284e1e)

Details

Provenance
avgAuthored on Jan 11 2022, 1:44 PM
Parents
rGeee25e8417cf: schedgraph.py: port to Python 3
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