rtc: r9701: remove useless memset

The RTC core already sets to zero the struct rtc_tie it passes to the
driver, avoid doing it a second time.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20201015191135.471249-3-alexandre.belloni@bootlin.com

drivers/rtc/rtc-r9701.c

@@ -75,8 +75,6 @@ static int r9701_get_datetime(struct device *dev, struct rtc_time *dt)
 	if (ret)
 		return ret;
 
-	memset(dt, 0, sizeof(*dt));
-
 	dt->tm_sec = bcd2bin(buf[0]); /* RSECCNT */
 	dt->tm_min = bcd2bin(buf[1]); /* RMINCNT */
 	dt->tm_hour = bcd2bin(buf[2]); /* RHRCNT */