* In `_wp_ajax_menu_quick_search()`, in an `else` block, `$post_obj` was set and not used. Another block sets it again and does use it.
* In `wp_nav_menu_item_post_type_meta_box()`, `$post_type_object` was set and, sadly, never used. `$error` was set and not used.
See #27882.
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