built dp_sideband_oob
--- run ---
[DF-1264] drm_dp_sideband_msg_build chunk[48] OOB write.
[DF-1264] Sink is in loadable drm.ko (module-only); reachable only
[DF-1264] via DisplayPort MST sideband replies from real MST HW.
[DF-1264] Not triggerable on this QEMU guest (no DP MST device).
[DF-1264] Bug confirmed in source; see VERDICT.md + fix.diff.