soc: qcom: apr: 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>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220114085019.42904-1-vulab@iscas.ac.cn

drivers/soc/qcom/apr.c

@@ -653,7 +653,6 @@ static void apr_remove(struct rpmsg_device *rpdev)
 
 	pdr_handle_release(apr->pdr);
 	device_for_each_child(&rpdev->dev, NULL, apr_remove_device);
-	flush_workqueue(apr->rxwq);
 	destroy_workqueue(apr->rxwq);
 }