Strictly speaking the examples/ change should be in its own patch.  See HACKING.

> @@ -911,9 +923,10 @@ static void dhcp_client_rx_message(const void *data, size_t len, void *userdata)
>               ia.s_addr = client->lease->address;
>   
>               /* For unit testing we don't want this to be a fatal error */
> -             if (!l_acd_start(client->acd, inet_ntoa(ia))) {
> +             if (!inet_ntop(AF_INET, &ia, buf, INET_ADDRSTRLEN) ||
> +                 !l_acd_start(client->acd, buf)) {
>                       CLIENT_DEBUG("Failed to start ACD on %s, continuing",
> -                                             inet_ntoa(ia));
> +                                  IP_STR(ia.s_addr));

Not sure introducing IP_STR macro just for this is worth it, but ok...

Looks like indentation problem here too.  Maybe you want to put the inet_ntop
business outside of l_strdup_printf call to make things more readable?