rtc: ds1307: Switch to managed irq allocation

Since we are not doing anything fancy in remove function that requires
us to sequence IRQ free operation, we might as well switch over to devm_
equivalent of managed IRQ allocation and remove the explicit free_irq
since it'd be done automatically at remove.

Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-ds1307.c

@@ -1156,9 +1156,10 @@ static int ds1307_probe(struct i2c_client *client,
 	}
 
 	if (want_irq) {
-		err = request_threaded_irq(client->irq, NULL, irq_handler,
-					   IRQF_SHARED | IRQF_ONESHOT,
-					   ds1307->rtc->name, client);
+		err = devm_request_threaded_irq(&client->dev,
+						client->irq, NULL, irq_handler,
+						IRQF_SHARED | IRQF_ONESHOT,
+						ds1307->rtc->name, client);
 		if (err) {
 			client->irq = 0;
 			dev_err(&client->dev, "unable to request IRQ!\n");
@@ -1212,9 +1213,6 @@ static int ds1307_remove(struct i2c_client *client)
 {
 	struct ds1307 *ds1307 = i2c_get_clientdata(client);
 
-	if (test_and_clear_bit(HAS_ALARM, &ds1307->flags))
-		free_irq(client->irq, client);
-
 	if (test_and_clear_bit(HAS_NVRAM, &ds1307->flags))
 		sysfs_remove_bin_file(&client->dev.kobj, ds1307->nvram);