(find_linked_aux_item_list): Don't use an uninitialized variable.

(delete_aux_item_list): Fail if the default branch is reached.
(undelete_aux_item_list): Fail if the default branch is reached.
(aux_item_trigger_mirror_faq): Test data->object for NULLness
	intstead of the uninitialized variable conf_stat.