def _find_vios(vios_list, lpar_id):
    """
    Returns the corresponding VioServer in the vios_list for the lpar_id

    :param vios_list: The list of VioServer objects.
    :param lpar_id: The lpar_id to find.

    :return: The VioServer from the vios_list that matches that lpar_id.  If
             one does not exist, None is returned.
    """
    for vio_server in vios_list:
        if vio_server.lpar_id == lpar_id:
            return vio_server
    return None