vboot_ui_menu: Checking vb2_update_menu return value

If return value is not VBERROR_SUCCESS, return
with an error.

BUG=None
BRANCH=None
TEST=None

Change-Id: I1402277567b901701cdd68d74968e43e838c89da
Signed-off-by: Shelley Chen <shchen@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/707496
Reviewed-by: Randall Spangler <rspangler@chromium.org>
1 file changed