Cleaning improved when quitting.

current/algorithms/heap_binomial.c

@@ -38,9 +38,12 @@ void visit_node_pre_order(node *q, void (*callback)(node *)) {
 void node_destroy(list *q) {
   void (*func)(node *) = (void (*)(node *))free;
   list *t = q;
+  list *prev = NULL;
   while (t) {
     visit_node_post_order(t->node, func);
+    prev = t;
     t = t->next;
+    free(prev);
   }
 }