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 <[e-mail]>
Cc: Ludovic Desroches <[e-mail]>
Signed-off-by: Nobuhiro Iwamatsu <[e-mail]>
Acked-by: Nicolas Ferre <[e-mail]>
Signed-off-by: Alexandre Belloni <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/rtc/rtc-at91sam9.c

···
 		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);