Always free the DB result in QBMapper::findEntities
Always free the DB result in QBMapper::findEntities

Without this patch it only happened if the code ran through without any
errors. Now the result is also freed in the case of an error.

Signed-off-by: Christoph Wurst <7abde52c298496fa169fb750f91f213a282142af@winzerhof-wurst.at>

nextcloud/server,nextcloud/server,nextcloud/server,nextcloud/server