* frame.c (Fcan_run_window_configuration_change_hook): Return a value.

src/ChangeLog

@@ -1,3 +1,7 @@
+2014-11-09  Paul Eggert  <eggert@cs.ucla.edu>
+
+	* frame.c (Fcan_run_window_configuration_change_hook): Return a value.
+
 2014-11-08  Jan Djärv  <jan.h.d@swipnet.se>
 
 	* nsterm.m (run): Only use non-system event loop if OSX version is

src/frame.c

@@ -2277,6 +2277,7 @@ functions on `window-configuration-change-hook' is impeded forever.  */)
   struct frame *f = decode_live_frame (frame);
 
   f->can_run_window_configuration_change_hook = NILP (allow) ? false : true;
+  return Qnil;
 }