Markus Elfring

Would you like to add more error handling for return values from functions like the following? * [fprintf](https://pubs.opengroup.org/onlinepubs/9799919799/functions/fprintf.html "Print formatted output.") ⇒ [save_address](https://github.com/avahi/avahi/blob/6d801ab52fd10aa6a204152b5d69aea62eef5028/avahi-autoipd/main.c#L265) * [pthread_mutex_init](https://pubs.opengroup.org/onlinepubs/9799919799/functions/pthread_mutex_init.html "Initialize a mutex.") ⇒ [avahi_threaded_poll_new](https://github.com/avahi/avahi/blob/6d801ab52fd10aa6a204152b5d69aea62eef5028/avahi-common/thread-watch.c#L86)