org-export: Fix "wrong number of arguments" error

* contrib/lisp/org-export.el (org-export-with-backend): Fix "wrong
  number of arguments" error.

This fixexs d1a075e6bb273bb19b4ed1a9eb9a3e44fc63a9ee.

contrib/lisp/org-export.el

@@ -2993,7 +2993,7 @@ channel used for export, as a plist.."
     (if (memq type '(nil org-data)) (error "No foreign transcoder available")
       (let ((transcoder
 	     (cdr (assq type (org-export-backend-translate-table back-end)))))
-	(if (functionp transcoder) (funcall transcoder contents info)
+	(if (functionp transcoder) (funcall transcoder data contents info)
 	  (error "No foreign transcoder available"))))))