vboot/ui: Fix access on to_dev screen

Broken recovery mode should not access to_dev screen.

BUG=b:146399181
TEST=CC=x86_64-pc-linux-gnu-clang;
     make clean && make runtests
BRANCH=none

Signed-off-by: Hsuan Ting Chen <roccochen@chromium.org>
Change-Id: I3e5802c14968aafe40d25e69505c518c0c5b45d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2228256
Reviewed-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
1 file changed