No reason for local_err here, use errp directly instead.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Gonglei <arei.gonglei@huawei.com>
Message-Id: <20191205174635.18758-20-vsementsov@virtuozzo.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>