drm/msm: drop return from gpu->submit()

At this point, there is nothing left to fail.  And submit already has a
fence assigned and is added to the submit_list.  Any problems from here
on out are asynchronous (ie. hangcheck/recovery).

Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/msm_gpu.c

@@ -540,12 +540,12 @@ int msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 			msm_gem_move_to_active(&msm_obj->base, gpu, false, submit->fence);
 	}
 
-	ret = gpu->funcs->submit(gpu, submit, ctx);
+	gpu->funcs->submit(gpu, submit, ctx);
 	priv->lastctx = ctx;
 
 	hangcheck_timer_reset(gpu);
 
-	return ret;
+	return 0;
 }
 
 /*