drm/scheduler: Fix job cleanup without timeout handler

After "5918045c drm/scheduler: rework job destruction", jobs are
only deleted when the timeout handler is able to be cancelled
successfully.

In case no timeout handler is running (timeout == MAX_SCHEDULE_TIMEOUT),
job cleanup would be skipped which may result in memory leaks.

Add the handling for the (timeout == MAX_SCHEDULE_TIMEOUT) case in
drm_sched_cleanup_jobs.
Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/306025/?series=60878&rev=2

drivers/gpu/drm/scheduler/sched_main.c

@@ -630,7 +630,8 @@ static void drm_sched_cleanup_jobs(struct drm_gpu_scheduler *sched)
 	unsigned long flags;
 
 	/* Don't destroy jobs while the timeout worker is running */
-	if (!cancel_delayed_work(&sched->work_tdr))
+	if (sched->timeout != MAX_SCHEDULE_TIMEOUT &&
+	    !cancel_delayed_work(&sched->work_tdr))
 		return;