[reSIProcate] memory leak in AresDns

[Kennard White]

Hi,

While running valgrind to check for memory leads with epoll changes, I found
a memory leak in the AresDns class. The resip-ares class returns dynamically
allocated hostent, which is unlike gethostbyname(). Patch is included.

Anyone know the history for this? Seems like a long time for this type of
memory leak to go undetected.

Kennard
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