rtc: cpcap: stop validating rtc_time in .read_time

The RTC core is always calling rtc_valid_tm after the read_time callback.
It is not necessary to call it just before returning from the callback.
Reviewed-by: NSebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: NAlexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-cpcap.c

@@ -119,7 +119,7 @@ static int cpcap_rtc_read_time(struct device *dev, struct rtc_time *tm)
 
 	cpcap2rtc_time(tm, &cpcap_tm);
 
-	return rtc_valid_tm(tm);
+	return 0;
 }
 
 static int cpcap_rtc_set_time(struct device *dev, struct rtc_time *tm)