Backport fix for bug#12879 from trunk

* lisp/emacs-lisp/gv.el (setf): Fix debug spec for multiple assignments

lisp/ChangeLog

+2012-11-15  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+	* emacs-lisp/gv.el (setf): Fix debug spec for multiple assignments
+	(bug#12879).
+
 2012-11-14  Glenn Morris  <rgm@gnu.org>
 	* subr.el (set-temporary-overlay-map): Doc fix.

lisp/emacs-lisp/gv.el

@@ -236,7 +236,7 @@ For example, (setf (cadr x) y) is equivalent to (setcar (cdr x) y).
 The return value is the last VAL in the list.
 
 \(fn PLACE VAL PLACE VAL ...)"
-  (declare (debug (gv-place form)))
+  (declare (debug (&rest [gv-place form])))
   (if (and args (null (cddr args)))
       (let ((place (pop args))
             (val (car args)))