Patch merged into coreboot/master: drivers/pc80/rtc: Check cmos checksum BEFORE reading cmos value

the following patch was just integrated into master:
commit 0e7a93fa65fcc7949c02ee9ac9a19af7351ee3f0
Author: Martin Roth 
Date:   Wed Jan 25 11:00:18 2017 -0700

drivers/pc80/rtc: Check cmos checksum BEFORE reading cmos value

If cmos is invalid, it doesn't make sense to read the value before
    finding that out.

Change-Id: Ieb4661aad7e4d640772325c3c6b184de1947edc3
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/18236
    Tested-by: build bot (Jenkins)
    Reviewed-by: Arthur Heymans 
    Reviewed-by: Paul Menzel

See https://review.coreboot.org/18236 for details.

-gerrit