media: platform: mtk-mdp: add missed destroy_workqueue in remove

The driver misses destroying wdt_wq when remove like what is done when
probe fails.
Add the missed calls like what is done to job_wq to fix it.
Signed-off-by: Chuhong Yuan <hslester96@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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

@@ -229,6 +229,9 @@ 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);