rtc: Replace flush_scheduled_work() with flush_work().

Since "struct rtc_device" is per a device struct, I assume that clear_uie()
needs to wait for only one work associated with that device. Therefore,
wait for only that work using flush_work().
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/8d3a0f55-d861-ba93-0d25-b1172eaa8343@I-love.SAKURA.ne.jp

drivers/rtc/dev.c

@@ -96,7 +96,7 @@ static int clear_uie(struct rtc_device *rtc)
 		}
 		if (rtc->uie_task_active) {
 			spin_unlock_irq(&rtc->irq_lock);
-			flush_scheduled_work();
+			flush_work(&rtc->uie_task);
 			spin_lock_irq(&rtc->irq_lock);
 		}
 		rtc->uie_irq_active = 0;