rtc: fix rtc_time64_to_tm for 3477

The current correction for leap years will fail in 3477. 3476-12-31 being
3477-01-00 because this is 366 leap years after 1970 and 3477 isn't a leap
year.

Fix that by looping over until days is positive or zero.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/rtc/rtc-lib.c b/drivers/rtc/rtc-lib.c
index ad5bb21908e5..4a3c0f3aab14 100644
--- a/drivers/rtc/rtc-lib.c
+++ b/drivers/rtc/rtc-lib.c
@@ -65,7 +65,7 @@ void rtc_time64_to_tm(time64_t time, struct rtc_time *tm)
         days -= (year - 1970) * 365
                 + LEAPS_THRU_END_OF(year - 1)
                 - LEAPS_THRU_END_OF(1970 - 1);
-        if (days < 0) {
+        while (days < 0) {
                 year -= 1;
                 days += 365 + is_leap_year(year);
         }