rtc: hym8563: use rtc_lock/rtc_unlock

Avoid accessing directly rtc->ops_lock and use the RTC core helpers.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210119220653.677750-7-alexandre.belloni@bootlin.com

drivers/rtc/rtc-hym8563.c

@@ -428,10 +428,9 @@ static irqreturn_t hym8563_irq(int irq, void *dev_id)
 {
 	struct hym8563 *hym8563 = (struct hym8563 *)dev_id;
 	struct i2c_client *client = hym8563->client;
-	struct mutex *lock = &hym8563->rtc->ops_lock;
 	int data, ret;
 
-	mutex_lock(lock);
+	rtc_lock(hym8563->rtc);
 
 	/* Clear the alarm flag */
 
@@ -451,7 +450,7 @@ static irqreturn_t hym8563_irq(int irq, void *dev_id)
 	}
 
 out:
-	mutex_unlock(lock);
+	rtc_unlock(hym8563->rtc);
 	return IRQ_HANDLED;
 }