rtc: at91sam9: Remove unnecessary offset variable checks

The offset variable is checked by at91_rtc_readalarm(), but this check
is unnecessary because the previous check knew that the value of this
variable was not 0.
This removes that unnecessary offset variable checks.

Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Cc: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210708051340.341345-1-nobuhiro1.iwamatsu@toshiba.co.jp

drivers/rtc/rtc-at91sam9.c

@@ -184,7 +184,7 @@ static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
 		return -EILSEQ;
 
 	memset(alrm, 0, sizeof(*alrm));
-	if (alarm != ALARM_DISABLED && offset != 0) {
+	if (alarm != ALARM_DISABLED) {
 		rtc_time64_to_tm(offset + alarm, tm);
 
 		dev_dbg(dev, "%s: %ptR\n", __func__, tm);