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Improved memory management code in ParseSoaReply()

Rodrigo Muino Tomonari requested to merge github/fork/uttampawar/malloced-buffer-cares into master
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included Test results: $ python tools/test.py -I 'parallel/test-dns*' [00:00|% 100|+ 12|- 0]: Done

$ make test [06:23|% 100|+ 2429|- 2]: Done Failed tests are not due to this change.

This change was to improve memory management by use of MallocedBuffer instead of malloc()/free() calls. I further removed use of structure "ares_soa_reply" by using just local variables which removed 2 additional malloc/free calls via ares_expand_name().

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