video: fix thread sanitizer warning #2826
Merged
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There was a sporadic warning from clang sanitizer:
stream_update /home/runner/work/baresip/baresip/src/stream.c:893 that
writes to stream->tx.pt_enc
vs
packet_handler /home/runner/work/baresip/baresip/src/video.c:353 that
reads from pt_enc
Found here:
https://github.com/baresip/baresip/actions/runs/7164207883/job/19503867573