Get all CFGNodes that has an out-degree of 0

        :return: A list of CFGNode instances
        :rtype:  list

def deadends(self):
        """
        Get all CFGNodes that has an out-degree of 0

        :return: A list of CFGNode instances
        :rtype:  list
        """
        if self.graph is None:
            raise AngrCFGError('CFG hasn\'t been generated yet.')

        deadends = [i for i in self.graph if self.graph.out_degree(i) == 0]

        return deadends