Fix undefined behavior in Intel's code

Change-Id: If0085c1dfba2f1b11a9392c73aac30f174773aab
Signed-off-by: Stefan Tauner <stefan.tauner@gmx.at>
Reviewed-on: http://review.coreboot.org/1517
Tested-by: build bot (Jenkins)
Reviewed-by: Anton Kochkov <anton.kochkov@gmail.com>
1 file changed