destroy the loaded say.conf on module unload

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@33786 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_playback.c

@@ -472,6 +472,9 @@ static int unload_module(void *mod)
 
 	STANDARD_HANGUP_LOCALUSERS;
 
+	if (say_cfg)
+		ast_config_destroy(say_cfg);
+
 	return res;	
 }