Chromium's vaapi_video_decoder may call vaCreateContext with surfaces=NULL,
surfaces_count=0 and then create surfaces afterwards via vaCreateSurfaces2.
In that order driver_data->video_format is still NULL when CreateContext
runs and our early `video_format == NULL` guard returns OPERATION_FAILED.
Confirmed via temporary request_log() — Brave hits exactly that path on
ohm.
Move the probe out of RequestCreateSurfaces into a new
video_format_probe() helper in video.c, and call it eagerly from
RequestInit. RequestCreateSurfaces still re-probes if init came up NULL,
which preserves the original lazy behaviour for any caller that needs it.
Also small clean-up of surface.c since the probe block moved out: drop
the now-dead `bool found` local.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
test0r
0a3432ad64