Fix compilation on GCC 10.2.1 and address the underlying issue. The printf format specifier for a size_t type is z. Change-Id: Ieb1db6c0c3eb4947bd3617e418bac238b70ec08f Signed-off-by: Benjamin Doron <benjamin.doron00@gmail.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/50051 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: HAOUAS Elyes <ehaouas@noos.fr> Reviewed-by: Angel Pons <th3fanbus@gmail.com>