rtc: ds1307: avoid using rtc-name

ds1307->rtc->name is a copy of ds1307->name, use it instead.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-ds1307.c

@@ -1567,7 +1567,7 @@ static int ds1307_probe(struct i2c_client *client,
 		err = devm_request_threaded_irq(ds1307->dev,
 						ds1307->irq, NULL, irq_handler,
 						IRQF_SHARED | IRQF_ONESHOT,
-						ds1307->rtc->name, ds1307);
+						ds1307->name, ds1307);
 		if (err) {
 			client->irq = 0;
 			device_set_wakeup_capable(ds1307->dev, false);