[BACKPORT] res_create_query: avoid single-byte buffer overwrite ... when the name ends with an escaped dot. CVE-2016-5180 https://c-ares.haxx.se/adv_20160929.html Bug: b/32205736 Test: Compile test app from aospg/300423 Change-Id: Ice232d136a81aaa9b29f58b2aea59e8c6467af28