[reSIProcate] Memory leak patch for DnsInterface.cxx

[Scott Zuk]

Hi,

I've attached a patch that fixes a small memory leak in 
DnsInterface::errorMessage() that occurs because the c string returned on the 
heap by ExternalDns::errorMessage() is not deleted.  The patch also modifies 
AresDns::errorMessage() in AresDns.cxx to append a null character to the 
error string, since the Data() constructor uses strlen() which requires the 
presence of a null char.

Regards,
~Scott

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