mod_sasl2_fast: Fix traceback when no cb_data is available (thanks riau) We already verify (earlier in the process) that cb_data is present if we are using a mechanism that requires it.

module:set_global();

local log = _G.log;

module:add_timer(60-os.date("%S"), function (now)
	log("info", "-- MARK --");
	return 90 - ((now + 30) % 60);
end);