[S] Change in coreboot[master]: lib/rtc: Add sanity check for time and date

[Michał Żygowski (Code Review)]

Attention is currently required from: Werner Zeh.

Michał Żygowski has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/54913?usp=email )

Change subject: lib/rtc: Add sanity check for time and date
......................................................................

Patch Set 3:

(1 comment)

File src/lib/rtc.c:

https://review.coreboot.org/c/coreboot/+/54913/comment/3f8496ea_2fc3ea71 :
PS3, Line 129: month == 2
First leap year and we already hit this off-by-one error 😊

Month is passed as 0-based, not 1-based.

This is quite critical as it may break certificates, file systems, etc.

CB:80790