Fix usage of `format' in `article-verify-x-pgp-sig'

* lisp/gnus/gnus-art.el (article-verify-x-pgp-sig): Use
`substring' instead of `format' to ensure a fresh string.

diff --git a/lisp/gnus/gnus-art.el b/lisp/gnus/gnus-art.el
index 7076dbedf2ee4560b7a5b8fa0f19305de34cec0f..7b6e15d6f87f28affaf58debae98a306ff96ab86 100644 (file)
--- a/lisp/gnus/gnus-art.el
+++ b/lisp/gnus/gnus-art.el
@@ -4279,7 +4279,7 @@ If variable `gnus-use-long-file-name' is non-nil, it is
            (insert "Version: " (car items) "\n\n")
            (insert (mapconcat #'identity (cddr items) "\n"))
            (insert "\n-----END PGP SIGNATURE-----\n")
-           (let ((mm-security-handle (list (format "multipart/signed"))))
+           (let ((mm-security-handle (list (substring "multipart/signed"))))
              (mml2015-clean-buffer)
              (let ((coding-system-for-write (or gnus-newsgroup-charset
                                                 'iso-8859-1)))