media: mtk-vcodec: 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.

This was generated with coccinelle:

@@
expression E;
@@
- 	flush_workqueue(E);
	destroy_workqueue(E);
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c

@@ -390,7 +390,6 @@ static int mtk_vcodec_dec_remove(struct platform_device *pdev)
 {
 	struct mtk_vcodec_dev *dev = platform_get_drvdata(pdev);
 
-	flush_workqueue(dev->decode_workqueue);
 	destroy_workqueue(dev->decode_workqueue);
 
 	if (media_devnode_is_registered(dev->mdev_dec.devnode)) {

drivers/media/platform/mtk-vcodec/mtk_vcodec_enc_drv.c

@@ -461,7 +461,6 @@ static int mtk_vcodec_enc_remove(struct platform_device *pdev)
 	struct mtk_vcodec_dev *dev = platform_get_drvdata(pdev);
 
 	mtk_v4l2_debug_enter();
-	flush_workqueue(dev->encode_workqueue);
 	destroy_workqueue(dev->encode_workqueue);
 	if (dev->m2m_dev_enc)
 		v4l2_m2m_release(dev->m2m_dev_enc);