While there, tidy up indentation, and add return just for consistency
and robustness.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20200313170517.22480-4-armbru@redhat.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
[The "while there" cleanups squashed in]