Delete duplicate `provide'.

(spam-unload-hook): Set as a variable with add-hook.

lisp/gnus/spam.el

@@ -1814,14 +1814,12 @@ REMOVE not nil, remove the ADDRESSES."
   (remove-hook 'gnus-get-new-news-hook 'spam-setup-widening)
   (remove-hook 'gnus-summary-prepare-hook 'spam-find-spam))
 
+(add-hook 'spam-unload-hook 'spam-unload-hook)
+
 (when spam-install-hooks
   (spam-initialize))
 
 (provide 'spam)
 
-;;; spam.el ends here.
-
-(provide 'spam)
-
 ;;; arch-tag: 07e6e0ca-ab0a-4412-b445-1f6c72a4f27f
 ;;; spam.el ends here