rtc: rx8010: Fix for incorrect return value

The err variable is not being reset after a successful read. Explicitly
return 0 at the end of function call to account for all return paths.
Reported-by: Jens-Peter Oswald <oswald@lre.de>
Signed-off-by: Akshay Bhat <akshay.bhat@timesys.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

drivers/rtc/rtc-rx8010.c

@@ -247,7 +247,7 @@ static int rx8010_init_client(struct i2c_client *client)
 
 	rx8010->ctrlreg = (ctrl[1] & ~RX8010_CTRL_TEST);
 
-	return err;
+	return 0;
 }
 
 static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
@@ -276,7 +276,7 @@ static int rx8010_read_alarm(struct device *dev, struct rtc_wkalrm *t)
 	t->enabled = !!(rx8010->ctrlreg & RX8010_CTRL_AIE);
 	t->pending = (flagreg & RX8010_FLAG_AF) && t->enabled;
 
-	return err;
+	return 0;
 }
 
 static int rx8010_set_alarm(struct device *dev, struct rtc_wkalrm *t)