media: mtk-mdp: Remove redundant 'flush_workqueue()' calls

'destroy_workqueue()' already drains the queue before destroying it, so
there is no need to flush it explicitly.

Remove the redundant 'flush_workqueue()' calls.
Signed-off-by: Xu Wang <vulab@iscas.ac.cn>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/mtk-mdp/mtk_mdp_core.c

@@ -245,10 +245,8 @@ static int mtk_mdp_remove(struct platform_device *pdev)
 	mtk_mdp_unregister_m2m_device(mdp);
 	v4l2_device_unregister(&mdp->v4l2_dev);
 
-	flush_workqueue(mdp->wdt_wq);
 	destroy_workqueue(mdp->wdt_wq);
 
-	flush_workqueue(mdp->job_wq);
 	destroy_workqueue(mdp->job_wq);
 
 	list_for_each_entry_safe(comp, comp_temp, &mdp->comp_list, node) {