[DNSfirewalls] named-ddb fails with assertion errors

[Kwasi Gyasi - Agyei]

>We keep coming across DNS failures resulting in the following in logs,
>this happens every 24hrs
>
>11-Oct-2013 15:25:40.975 general: critical: name.c:2104:
>REQUIRE(suffixlabels > 0) failed, back trace
>11-Oct-2013 15:25:40.975 general: critical: #0 0x7f836eb10b1f in ??
>11-Oct-2013 15:25:40.975 general: critical: #1 0x7f836d4bf89a in ??
>11-Oct-2013 15:25:40.975 general: critical: #2 0x7f836e386bc5 in ??
>11-Oct-2013 15:25:40.975 general: critical: #3 0x7f836eb187a8 in ??
>11-Oct-2013 15:25:40.975 general: critical: #4 0x7f836eb1e297 in ??
>11-Oct-2013 15:25:40.975 general: critical: #5 0x7f836eb2247c in ??
>11-Oct-2013 15:25:40.975 general: critical: #6 0x7f836eb07746 in ??
>11-Oct-2013 15:25:40.975 general: critical: #7 0x7f836d4de2f8 in ??
>11-Oct-2013 15:25:40.975 general: critical: #8 0x7f836bfd6851 in ??
>11-Oct-2013 15:25:40.975 general: critical: #9 0x7f836b53894d in ??
>11-Oct-2013 15:25:40.975 general: critical: exiting (due to assertion
>failure)