dix: When the last slave is removed, set master to the original classes.

DeviceClassesChangedEvent is sent to the client, where device == new slave.

Xi/listdev.h

@@ -44,15 +44,9 @@ void SRepXListInputDevices(ClientPtr /* client */ ,
     );
 
 void
-CopySwapKeyClass(ClientPtr /* client */, 
-                 KeyClassPtr /* k */, 
-                 char** /* buf */);
-void
-CopySwapButtonClass(ClientPtr /* client */, 
-                    ButtonClassPtr /* b */, 
-                    char** /* buf */);
-int
-CopySwapValuatorClass(ClientPtr /* client */, 
-                      ValuatorClassPtr /* v */, 
-                      char** /* buf */);
+CopySwapClasses(ClientPtr /* client */,
+                DeviceIntPtr /* dev */,
+                CARD8* /* num_classes */,
+                char** /* classbuf */);
+
 #endif /* LISTDEV_H */