Fixed a stupid bug in list_move_to_list(): it did not work for empty lists.

The kernel no longer trashes memory when you delete a port without any
messages in its queue (i.e. you can now safely link against libbe.so :)).


git-svn-id: file:///srv/svn/repos/haiku/trunk/current@8736 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/kernel/core/util/list.c

@@ -198,10 +198,18 @@ list_remove_tail_item(struct list *list)
 void
 list_move_to_list(struct list *sourceList, struct list *targetList)
 {
+	if (list_is_empty(sourceList)) {
+		targetList->link.next = targetList->link.prev = &targetList->link;
+		return;
+	}
+
 	*targetList = *sourceList;
+
+	// correct link pointers to this list
 	targetList->link.next->prev = &targetList->link;
 	targetList->link.prev->next = &targetList->link;
 
+	// empty source list
 	sourceList->link.next = sourceList->link.prev = &sourceList->link;
 }