@Override
	public void setKeyCount(int cnt) {
		keyCount = cnt;
		buffer.putInt(KEY_COUNT_OFFSET, keyCount);
	}
Get the root for this node.  If setParent has not been invoked, this node
is assumed to be the root.
@return root node
Ghidra/Framework/DB/src/main/java/db/FixedKeyNode.java