Removed cast from void* to int, it does not work on 64-bit machines.

Besides, pointer comparison on equality/inequality is strictly defined
in C.

@@ -140,7 +140,7 @@ list_remove (list_t list, void *item)
   for (previous = &(list->head), current = list->head.next;
        current != &(list->head); previous = current, current = current->next)
     {
-      if ((int)current->item == (int)item)
+      if (current->item == item)
 	{
 	  previous->next = current->next;
 	  current->next->prev = previous;

@@ -195,7 +195,7 @@ observable_detach (observable_t observable, observer_t observer)
     {
       event = NULL;
       iterator_current (iterator, (void **)&event);
-      if (event && (int)(event->observer) == (int)observer)
+      if (event && event->observer == observer)
         {
           found = 1;
           break;