Minor problem in getControlObject?

This may not be too important and its also in the example game code, but, shouldn't this return -1 instead of 0 if there is no control object?

// gameConnection.cc : 1216
ConsoleMethod( GameConnection, getControlObject, S32, 2, 2, "")
{
argv;
SimObject* cp = object->getControlObject();
return cp? cp->getId(): 0;
}