media: mtk-vpu: 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-vpu/mtk_vpu.c

@@ -964,10 +964,8 @@ static int mtk_vpu_remove(struct platform_device *pdev)
 #ifdef CONFIG_DEBUG_FS
 	debugfs_remove(vpu_debugfs);
 #endif
-	if (vpu->wdt.wq) {
-		flush_workqueue(vpu->wdt.wq);
+	if (vpu->wdt.wq)
 		destroy_workqueue(vpu->wdt.wq);
-	}
 	vpu_free_ext_mem(vpu, P_FW);
 	vpu_free_ext_mem(vpu, D_FW);
 	mutex_destroy(&vpu->vpu_mutex);