cpu/x86/smm: Add overflow check

Rather bail out than run into undefined behavior.

Change-Id: Ife26a0abed0ce6bcafe1e7cd8f499618631c4df4
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/38763
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: <cedarhouse1@comcast.net>

0 files changed, 0 insertions, 0 deletions