* mixi.el: (with-mixi-retrieve): Don't bind `buffer' variable.

* mixi.el: (with-mixi-retrieve): Don't bind `buffer' variable.
(with-mixi-post-form): Ditto.
(mixi-get-matched-items): Follow the change above.
(mixi-make-me): Ditto.
(mixi-realize-diary): Ditto.
(mixi-post-diary): Ditto.
(mixi-realize-community): Ditto.
(mixi-realize-topic): Ditto.
(mixi-post-topic): Ditto.
(mixi-realize-event): Ditto.
(mixi-post-comment): Ditto.
(mixi-realize-message): Ditto.
(mixi-post-message): Ditto.
(mixi-realize-news): Ditto.
(mixi-realization-error): Ditto.
(mixi-post-error): Ditto.