rtc: rx8010: Fix return code for rx8010_probe

In the current code, the return value of devm_request_threaded_irq may be
returned. This fixes it.

CC: Alessandro Zummo <a.zummo@towertech.it>
CC: Alexandre Belloni <alexandre.belloni@bootlin.com>
CC: Akshay Bhat <akshay.bhat@timesys.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Link: https://lore.kernel.org/r/20191217121231.2698817-2-iwamatsu@nigauri.orgSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-rx8010.c

@@ -465,7 +465,7 @@ static int rx8010_probe(struct i2c_client *client,
 
 	rx8010->rtc->max_user_freq = 1;
 
-	return err;
+	return 0;
 }
 
 static struct i2c_driver rx8010_driver = {