ich_descriptors_tool: Fix an off-by-one

BUG=chromium:478356
BRANCH=none
TEST=still builds

Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/19045
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Change-Id: Ie0d81d4b92a45d576439fc03d0efbe0d8860fb47
Signed-off-by: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/1672911
Reviewed-by: Sam McNally <sammc@chromium.org>
1 file changed