Silence icalendar-tests.el compilation

* test/automated/icalendar-tests.el (icalendar-tests--do-test-cycle):
Use with-current-buffer.

test/ChangeLog

 2013-07-11  Glenn Morris  <rgm@gnu.org>
 
+	* automated/icalendar-tests.el (icalendar-tests--do-test-cycle):
+	Use with-current-buffer.
+
 	* automated/undo-tests.el (undo-test-buffer-modified)
 	(undo-test-file-modified): New tests.
 

test/automated/icalendar-tests.el

@@ -1194,8 +1194,7 @@ Argument INPUT icalendar event string."
 	      (should (string= org-input cycled)))))
       ;; clean up
       (kill-buffer (find-buffer-visiting temp-diary))
-      (save-excursion
-	(set-buffer (find-buffer-visiting temp-ics))
+      (with-current-buffer (find-buffer-visiting temp-ics)
 	(set-buffer-modified-p nil)
 	(kill-buffer (current-buffer)))
       (delete-file temp-diary)