rtc: jz4740: remove useless check

rtc_time64_to_tm always returns a valid tm, it is not necessary to validate
it.
Tested-by: Mathieu Malaterre <malat@debian.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

drivers/rtc/rtc-jz4740.c

@@ -198,7 +198,7 @@ static int jz4740_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 
 	rtc_time64_to_tm(secs, &alrm->time);
 
-	return rtc_valid_tm(&alrm->time);
+	return 0;
 }
 
 static int jz4740_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)