UnregisterNode
status_t UnregisterNode(BMediaNode* node);
void UnregisterNode( BMediaNode *node, BMessage *settings );
fAddOn->UnregisterNode( this, &settings );
BMediaRoster::Roster()->UnregisterNode(fVideoNode);
BMediaRoster::Roster()->UnregisterNode(this);
status_t UnregisterNode(media_node_id nodeID,
status_t status = gNodeManager->UnregisterNode(request.node_id,
status_t result = fMediaRoster->UnregisterNode(fSystemTimeSource);
rv = roster->UnregisterNode(producer);
rv = roster->UnregisterNode(consumer);