host/lib/flashrom_drv.c: Ensure buffer is large enough in write op
host/lib/flashrom_drv.c: Ensure buffer is large enough in write op

BUG=b:207808292
BRANCH=none
TEST=emerge-octopus and cros deploy'ed

Signed-off-by: Edward O'Callaghan <5ed2e9bf3d98d5f12a86c198971e1dafd1bbd008@google.com>
Change-Id: I8a8f941f224416d872592d6cc2de4caf058cb5bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/3512274
Reviewed-by: Hung-Te Lin <8a7fce4940baad93a69f5073b383c85deed9d9c4@chromium.org>
Tested-by: Edward O'Callaghan <5ed2e9bf3d98d5f12a86c198971e1dafd1bbd008@chromium.org>
Auto-Submit: Edward O'Callaghan <5ed2e9bf3d98d5f12a86c198971e1dafd1bbd008@chromium.org>
Reviewed-by: Nikolai Artemiev <ae95c3c53a91f37eed715bc8c4b874a04007f68d@google.com>
Commit-Queue: Nikolai Artemiev <ae95c3c53a91f37eed715bc8c4b874a04007f68d@google.com>

coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot,coreboot/vboot