Make sure that a pointer exists before dereferencing it. Change-Id: I1a9833bb9686451224249efe599346f64dc37874 Signed-off-by: Arthur Heymans <arthur@aheymans.xyz> Reviewed-on: https://review.coreboot.org/c/coreboot/+/70011 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Elyes Haouas <ehaouas@noos.fr>