drm/amdgpu: some code refinement v2

Fix the code alignment, etc.

v2: rebase the code
Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c

@@ -33,12 +33,13 @@ static int amdgpu_sched_prepare_job(struct amd_gpu_scheduler *sched,
 {
 	int r = 0;
 	struct amdgpu_cs_parser *sched_job = (struct amdgpu_cs_parser *)job;
-	if (sched_job->prepare_job)
+	if (sched_job->prepare_job) {
 		r = sched_job->prepare_job(sched_job);
 		if (r) {
 			DRM_ERROR("Prepare job error\n");
 			schedule_work(&sched_job->job_work);
 		}
+	}
 	return r;
 }