Finding an item in TreeCtrl (recursive function)

This function searches in a tree control for an item’s associated data.
If an exact data match is found, the matching item is returned, otherwise, NULL is returned.

HTREEITEM CTreeCtrlX::FindData(HTREEITEM hti, DWORD dwData)
{
	if(hti == NULL) return NULL;
	if(GetItemData( hti ) == dwData)
        {
		Select( hti, TVGN_CARET);
		EnsureVisible( hti );
                return hti;
        }

	hti = GetChildItem( hti );
	do
	{
		HTREEITEM hti_res;
		if((hti_res = FindData( hti, dwData)) !=NULL )
		       return hti_res;

	}while( (hti = GetNextSiblingItem( hti )) != NULL );
	return NULL;
}