res_ari_events: Add module reference when a WebSocket is open.

This change ensures that the module isn't unloaded when a
WebSocket is open. Previously it was possible to unload the
module manually or during shutdown which could cause a crash
when any active WebSockets were terminated.

ASTERISK-28585

Change-Id: I85c71ab112f99875b586419a34c08c8b34c14c5c

res/res_ari_events.c

@@ -150,6 +150,8 @@ static void ast_ari_events_event_websocket_ws_established_cb(struct ast_websocke
 	RAII_VAR(struct ast_websocket *, s, ws_session, ast_websocket_unref);
 	RAII_VAR(struct ast_ari_websocket_session *, session, NULL, ao2_cleanup);
 
+	SCOPED_MODULE_USE(ast_module_info->self);
+
 	response = ast_calloc(1, sizeof(*response));
 	if (!response) {
 		ast_log(LOG_ERROR, "Failed to create response.\n");

rest-api-templates/res_ari_resource.c.mustache

@@ -198,6 +198,8 @@ static void ast_ari_{{c_name}}_{{c_nickname}}_ws_established_cb(struct ast_webso
 	struct ast_variable *path_vars = NULL;
 {{/has_path_parameters}}
 
+	SCOPED_MODULE_USE(ast_module_info->self);
+
 {{#has_parameters}}
 	response = ast_calloc(1, sizeof(*response));
 	if (!response) {