drm/v3d: Simplify job refcount handling

Instead of checking if the job is NULL every time we call the function,
check it inside the function.
Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231130164420.932823-6-mcanal@igalia.com

drivers/gpu/drm/v3d/v3d_submit.c

@@ -129,6 +129,9 @@ void v3d_job_cleanup(struct v3d_job *job)
 
 void v3d_job_put(struct v3d_job *job)
 {
+	if (!job)
+		return;
+
 	kref_put(&job->refcount, job->free);
 }
 
@@ -517,11 +520,9 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
 						 &se,
 						 last_job->done_fence);
 
-	if (bin)
-		v3d_job_put(&bin->base);
+	v3d_job_put(&bin->base);
 	v3d_job_put(&render->base);
-	if (clean_job)
-		v3d_job_put(clean_job);
+	v3d_job_put(clean_job);
 
 	return 0;