rtc: 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.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
diff --git a/drivers/rtc/rtc-rp5c01.c b/drivers/rtc/rtc-rp5c01.c
index 043b166..f1c160f 100644
--- a/drivers/rtc/rtc-rp5c01.c
+++ b/drivers/rtc/rtc-rp5c01.c
@@ -115,7 +115,7 @@ static int rp5c01_read_time(struct device *dev, struct rtc_time *tm)
 	rp5c01_unlock(priv);
 	spin_unlock_irq(&priv->lock);
 
-	return rtc_valid_tm(tm);
+	return 0;
 }
 
 static int rp5c01_set_time(struct device *dev, struct rtc_time *tm)