Busted ghost pointers

tree_alloc.c

@@ -322,6 +322,9 @@ void remove_node(TreeAlloc **root_ptr, TreeAlloc *node) {
 		node->left->parent = tmp;
 	}
 
+  	// Make sure that it doesn't have any tree pointers it shouldn't have.
+  	node->parent = node->left = node->right = NULL;
+
 	if (replace && replace->parent == NULL) {
 #ifdef DEBUG
       printf("=== PRE-REMOVE-FIXUP ===\n");