add a note to hopefully decrease the chance that someone forgets to increment

.cleancount after changing the ast_channel structure


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@8949 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/channel.h

@@ -261,6 +261,9 @@ struct ast_channel_spy_list;
 
 /*! Main Channel structure associated with a channel. 
  * This is the side of it mostly used by the pbx and call management.
+ *
+ * \note XXX It is important to remember to increment .cleancount each time
+ *       this structure is changed. XXX
  */
 struct ast_channel {
 	/*! ASCII unique channel name */