mb/google/brya/var/{kano,osiris,taeko}: Add null pointer check

Without part no. in CBI, mainboard_get_dram_part_num returns null.
To prevent passing this null pointer to strcmp and avoid unexpected
behavior, proper handling is necessary.

BUG=none
TEST=emerge-brya coreboot

Change-Id: I47e42376c6b1347c56afaec218aed63c5469f0aa
Signed-off-by: Wisley Chen <wisley.chen@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77646
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Reviewed-by: David Wu <david_wu@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions