By copying this code I got bad comments in reviewboard... Better fix the original.

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@215023 f38db490-d61c-443f-a65b-d21fe96a405b

funcs/func_volume.c

@@ -68,7 +68,7 @@ static void destroy_callback(void *data)
 
 	/* Destroy the audiohook, and destroy ourselves */
 	ast_audiohook_destroy(&vi->audiohook);
-	free(vi);
+	ast_free(vi);
 
 	return;
 }