Aria does not check for the result of my_random_bytes call

As we recently found out, my_random_bytes can encounter an error and return a failure. Most callers in MariaDB check the result of the call, but Aria does not, it happily proceeds regardless the outcome. I'm not sure what exactly can be a delayed effect of it either for encryption or for UUID, but I assume if it calls the function, it expects it to work, so it should be verified.