closes issue #11285, where an unload of a module that creates a dialplan context, causes a crash when you do a 'dialplan show' of that context. This is because the registrar string is defined in the module, and the stale pointer is traversed. The reporter offered a patch that would always strdup the registrar string, which is practical, but I preferred to destroy the created contexts in each module where one is created. That seemed more symmetric. There were only 6 place in asterisk where this is done: chan_sip, chan_iax2, chan_skinny, res_features, app_dial, and app_queue. The two apps destroyed the context, but left the contexts. All is fixed now and unloads should be dialplan friendly.

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89513 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/app_queue.c

@@ -5516,6 +5516,7 @@ static int unload_module(void)
 
 	if ((con = ast_context_find("app_queue_gosub_virtual_context"))) {
 		ast_context_remove_extension2(con, "s", 1, NULL);
+		ast_context_destroy(con, "app_queue"); /* leave no trace */
 	}
 
 	clear_and_free_interfaces();