Make sure that the type of the loop index matches the type of the upper bound. This fixes several -Wsign-compare warnings. Change-Id: Iaa94ce93bc35d523bc782ad914bfd283606becac Signed-off-by: Jacob Garber <jgarber1@ualberta.ca> Reviewed-on: https://review.coreboot.org/c/coreboot/+/33850 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Martin Roth <martinroth@google.com>