Stop of logging of No Valid Signature Found

[Robert Moskowitz]

Yes, I know lots of places don't have DNSSEC signed zones.  **I** have 
not done mine yet, but I turned on DNSSEC checking on my server and I am 
getting all too many messages like:

       validating @0xb4247b50: 117.in-addr.arpa NSEC: no valid signature 
found: 1 Time(s)
       validating @0xb4247b50: 117.in-addr.arpa SOA: no valid signature 
found: 1 Time(s)


How can I stop the logging of only " no valid signature found"?  So I 
can watch for more meaningful events and not so quickly grow 
/var/log/messages?