Bugfixes.

* mailbox/listlist.c (mu_list_append_list)
(mu_list_prepend_list): Initialize head.next and head.prev
if the destination list was empty.
* mailbox/freeitem.c: Include stdlib.h.
* mailbox/list.c: Minor style fix.

@@ -19,6 +19,7 @@
 #ifdef HAVE_CONFIG_H
 # include <config.h>
 #endif
+#include <stdlib.h>
 
 /* Default destroy_item function. */
 void

@@ -359,7 +359,7 @@ mu_list_do (mu_list_t list, mu_list_action_t *action, void *cbdata)
 
   if (list == NULL || action == NULL)
     return EINVAL;
-  status = mu_list_get_iterator(list, &itr);
+  status = mu_list_get_iterator (list, &itr);
   if (status)
     return status;
   for (mu_iterator_first (itr); !mu_iterator_is_done (itr);

@@ -107,6 +107,7 @@ mu_list_append_list (mu_list_t list, mu_list_t new_list)
   if (list->count == 0)
     {
       list->head = new_list->head;
+      list->head.next->prev = list->head.prev->next = &list->head;
       list->count = new_list->count;
     }
   else
@@ -123,6 +124,7 @@ mu_list_prepend_list (mu_list_t list, mu_list_t new_list)
   if (list->count == 0)
     {
       list->head = new_list->head;
+      list->head.next->prev = list->head.prev->next = &list->head;
       list->count = new_list->count;
     }
   else