GetInstancesFor
status_t GetInstancesFor(media_addon_id addon,
error = fRoster->GetInstancesFor(dni[i].addon, dni[i].flavor_id,
status_t error = fRoster->GetInstancesFor(dni->addon, dni->flavor_id, &node_id);
status_t err = roster->GetInstancesFor(nodeInfo->addon,
if (roster->GetInstancesFor(info->addon, info->flavor_id, &node_id) == B_OK)