drivers: tests: rtc: relax y2k test seconds check

When testing y2k rollover, the seconds value can easily be off by one
since there is no guarantee that the RTC will be exactly on the second
boundary.
Relax the check to allow for a one second difference.

Signed-off-by: Benjamin Cabé <[email protected]>

Author: kartben

tests/drivers/rtc/rtc_api/src/test_y2k.c

@@ -67,5 +67,9 @@ ZTEST(rtc_api, test_y2k)
 		     rtm[Y2K].tm_wday);
 	zassert_equal(rtm[Y2K].tm_hour, 0, "wrong hour: %d", rtm[Y2K].tm_hour);
 	zassert_equal(rtm[Y2K].tm_min, 0, "wrong minute: %d", rtm[Y2K].tm_min);
-	zassert_equal(rtm[Y2K].tm_sec, SECONDS_AFTER, "wrong second: %d", rtm[Y2K].tm_sec);
+	/* We're testing Y2K rollover, not precise timing. Seconds should be small but exact value
+	 * doesn't matter
+	 */
+	zassert_true(rtm[Y2K].tm_sec <= SECONDS_AFTER + 1, "seconds out of valid range: %d",
+		     rtm[Y2K].tm_sec);
 }