(whitespace-style, whitespace-trailing-regexp): Silence compiler.

lisp/ChangeLog

 2009-01-11  Glenn Morris  <rgm@gnu.org>
+	* diff-mode.el (whitespace-style, whitespace-trailing-regexp):
+	Silence compiler.
+
 	* emacs-lisp/authors.el (authors-aliases): Add, remove, and adjust
 	some entries.
 	(authors-fixed-case, authors-ignored-files, authors-valid-file-names):

lisp/diff-mode.el

@@ -1230,6 +1230,9 @@ See `after-change-functions' for the meaning of BEG, END and LEN."
   (diff-hunk-next arg)
   (diff-goto-source))
 
+(defvar whitespace-style)
+(defvar whitespace-trailing-regexp)
+
 ;;;###autoload
 (define-derived-mode diff-mode fundamental-mode "Diff"
   "Major mode for viewing/editing context diffs.