Constify the return values of ast_parking_ext() and ast_pickup_ext()

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@67853 65c4cc65-6c06-0410-ace0-fbb531ad65f3

include/asterisk/features.h

@@ -73,10 +73,10 @@ int ast_masq_park_call(struct ast_channel *rchan, struct ast_channel *host, int
 /*! \brief Determine system parking extension
  *  Returns the call parking extension for drivers that provide special
     call parking help */
-char *ast_parking_ext(void);
+const char *ast_parking_ext(void);
 
 /*! \brief Determine system call pickup extension */
-char *ast_pickup_ext(void);
+const char *ast_pickup_ext(void);
 
 /*! \brief Bridge a call, optionally allowing redirection */
 int ast_bridge_call(struct ast_channel *chan, struct ast_channel *peer,struct ast_bridge_config *config);

res/res_features.c

@@ -179,12 +179,12 @@ AST_MUTEX_DEFINE_STATIC(parking_lock);	/*!< protects all static variables above
 
 static pthread_t parking_thread;
 
-char *ast_parking_ext(void)
+const char *ast_parking_ext(void)
 {
 	return parking_ext;
 }
 
-char *ast_pickup_ext(void)
+const char *ast_pickup_ext(void)
 {
 	return pickup_ext;
 }
@@ -322,7 +322,7 @@ static int adsi_announce_park(struct ast_channel *chan, char *parkingexten)
 }
 
 /*! \brief Notify metermaids that we've changed an extension */
-static void notify_metermaids(char *exten, char *context)
+static void notify_metermaids(const char *exten, char *context)
 {
 	if (option_debug > 3)
 		ast_log(LOG_DEBUG, "Notification of state change to metermaids %s@%s\n", exten, context);