In lib/isc/tests/sockaddr_test.c

The loop variable `i` is never used, causing all tests > 0 to be
effectively ignored because the array offset data4[0] is hardcoded:

    for (i = 0; i < sizeof(data4)/sizeof(data4[0]); i++) {
        in.s_addr = inet_addr(data4[0].string);
        isc_sockaddr_fromin(&addr, &in, 1);
        r = isc_sockaddr_isnetzero(&addr);
        ATF_CHECK_EQ(r, data4[0].expect);
    }