drm/sched: Fix static checker warning for potential NULL ptr

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1558533443-7795-1-git-send-email-andrey.grodzovsky@amd.com

drivers/gpu/drm/scheduler/sched_main.c

@@ -286,16 +286,17 @@ static void drm_sched_job_timedout(struct work_struct *work)
 	job = list_first_entry_or_null(&sched->ring_mirror_list,
 				       struct drm_sched_job, node);
 
-	if (job)
+	if (job) {
 		job->sched->ops->timedout_job(job);
 
-	/*
-	 * Guilty job did complete and hence needs to be manually removed
-	 * See drm_sched_stop doc.
-	 */
-	if (sched->free_guilty) {
-		job->sched->ops->free_job(job);
-		sched->free_guilty = false;
+		/*
+		 * Guilty job did complete and hence needs to be manually removed
+		 * See drm_sched_stop doc.
+		 */
+		if (sched->free_guilty) {
+			job->sched->ops->free_job(job);
+			sched->free_guilty = false;
+		}
 	}
 
 	spin_lock_irqsave(&sched->job_list_lock, flags);