Use correct coding system when verifying a pgp signed message

* mm-uu.el (mm-uu-pgp-signed-extract-1): Use buffer-file-coding-system
if set.

lisp/gnus/ChangeLog

+2010-04-01  Andreas Schwab  <schwab@linux-m68k.org>
+
+	* mm-uu.el (mm-uu-pgp-signed-extract-1): Use buffer-file-coding-system
+	if set.
+
 2010-03-29  Katsumi Yamaoka  <yamaoka@jpl.org>
 
 	* mm-decode.el (mm-add-meta-html-tag): Fix regexp matching meta tag.

lisp/gnus/mm-uu.el

@@ -486,9 +486,11 @@ apply the face `mm-uu-extract'."
       (if (mm-uu-pgp-signed-test)
 	  (progn
 	    (mml2015-clean-buffer)
-	    (let ((coding-system-for-write (or gnus-newsgroup-charset
+	    (let ((coding-system-for-write (or buffer-file-coding-system
+					       gnus-newsgroup-charset
 					       'iso-8859-1))
-		  (coding-system-for-read (or gnus-newsgroup-charset
+		  (coding-system-for-read (or buffer-file-coding-system
+					      gnus-newsgroup-charset
 					      'iso-8859-1)))
 	      (funcall (mml2015-clear-verify-function))))
 	(when (and mml2015-use (null (mml2015-clear-verify-function)))