Claude review: drm/sched: fix NULL deref when logging missing entity runqueue

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Overall Series Review

Subject: drm/sched: fix NULL deref when logging missing entity runqueue
Author: Candice Li <candice.li@amd.com>
Patches: 5
Reviewed: 2026-06-04T11:58:59.136755

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This is a single-patch fix for a real NULL pointer dereference in `drm_sched_job_init()`. The analysis is correct: `job->sched` is not initialized until `drm_sched_job_arm()` (line 653), and furthermore `drm_sched_job_init()` itself `memset(job, 0, ...)` at line 611 — but that memset happens *after* the `entity->rq` check, so at the point of the `dev_err()` call, `job->sched` is whatever garbage the caller passed in (uninitialized memory). Dereferencing `job->sched->dev` is a guaranteed NULL or wild-pointer dereference.

The fix is correct in substance. One minor style concern below.

**Verdict: The fix is correct and should be applied, with a minor nit on the log format.**

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