Add comments to make it easier to decode return codes

At present in some cases it takes quite a while to figure out what
enum an error code corresponds to. Add a few comments to make this a
little faster.

BUG=b:191646387
BRANCH=none
TEST=FEATURES=test sudo -E  emerge vboot_reference

Signed-off-by: Simon Glass <sjg@chromium.org>
Change-Id: I72311d6fdf3c95284f26f28341f2d7d103f6a616
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2975085
Reviewed-by: Julius Werner <jwerner@chromium.org>
1 file changed