Method makeBlack

src/java/org/apache/poi/util/BinaryTree.java:635–641

force a node (if it exists) black @param node the node (may be null) in question @param index _KEY or _VALUE

(Node node, int index)

     * @param index _KEY or _VALUE
     */
    private static void makeBlack(Node node, int index)
    {
        if (node != null)
        {
            node.setBlack(index);
        }
    }

    /**
     * get a node's grandparent. mind you, the node, its parent, or