hwid: Change to use logging.debug if no error occurrs.

This is to avoid logging sensitive infomation like registration
codes.

BUG=None
TEST=Manual

Change-Id: Ibf047b6f0b4aed7f8ebcb617089f91824ec47de0
Reviewed-on: https://gerrit.chromium.org/gerrit/48213
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
1 file changed