* nnrss.el (nnrss-decode-entities-unibyte-string): Use `buffer-string'.

* nnrss.el (nnrss-decode-entities-unibyte-string): Use `buffer-string'.
* nndoc.el (nndoc-dissect-mime-parts-sub): do.
* nndb.el (nndb-request-accept-article, nndb-status-message): do.
* mm-url.el (mm-url-decode-entities-string): do.
* mml1991.el (mml1991-mailcrypt-sign, mml1991-gpg-sign): do.
* mm-decode.el (mm-find-raw-part-by-type): do.
* message.el (message-send-mail-partially)
(message-send-mail-with-sendmail): do.
* gnus-uu.el (gnus-uu-save-article, gnus-uu-reginize-string): do.
* gnus-kill.el (gnus-pp-gnus-kill): do.
* gnus-art.el (gnus-article-treat-unfold-headers)
(gnus-article-encrypt-body): do.