Completion of error handling

Would you like to [add more error handling](https://github.com/romanbsd/statsd-c-client/blob/611ae909f76dfd3adcbfc58fef3936296d50319c/uptimed.c#L85 "Update candidate: main()") for return values from functions like “[statsd_init_with_namespace](https://github.com/romanbsd/statsd-c-client/blob/0bfa3d59e29ad7eff332c9e2506a23d311ff8db4/statsd-client.c#L15 "Software initialisation")”?