staging/ks7010: 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.

Reported-by: Zeal Robot <[e-mail]>
Signed-off-by: Minghao Chi (CGEL ZTE) <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/ks7010/ks7010_sdio.c

···
 	if (ret)	/* memory allocation failure */
 		goto err_free_card;
 
-	if (priv->wq) {
-		flush_workqueue(priv->wq);
+	if (priv->wq)
 		destroy_workqueue(priv->wq);
-	}
 
 	hostif_exit(priv);