fix memory leak from not destroying the scheduler context on module unload

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@9609 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_iax2.c

@@ -9506,6 +9506,7 @@ static int __unload_module(void)
 	ast_channel_unregister(&iax2_tech);
 	delete_users();
 	iax_provision_unload();
+	sched_context_destroy(sched);
 	return 0;
 }
 

channels/chan_mgcp.c

@@ -4388,6 +4388,7 @@ int unload_module()
 	ast_cli_unregister(&cli_debug);
 	ast_cli_unregister(&cli_no_debug);
 	ast_cli_unregister(&cli_mgcp_reload);
+	sched_context_destroy(sched);
 
 	return 0;
 }

channels/chan_sip.c

@@ -13219,6 +13219,7 @@ int unload_module()
 	clear_realm_authentication(authl);
 	clear_sip_domains();
 	close(sipsock);
+	sched_context_destroy(sched);
 		
 	return 0;
 }

pbx/pbx_dundi.c

@@ -4726,6 +4726,7 @@ int unload_module(void)
 	ast_unregister_switch(&dundi_switch);
 	ast_custom_function_unregister(&dundi_function);
 	res = ast_unregister_application(app);
+	sched_context_destroy(sched);
 	return res;
 }