Honghai Zhang 3e02430587 Fix a stun attribute leak.
In https://cs.chromium.org/chromium/src/third_party/webrtc/p2p/base/stun.cc?rcl=1474384719&l=352,
if read returned false, the created attr would not be released.

BUG=chromium:648064
R=skvlad@webrtc.org

Review URL: https://codereview.webrtc.org/2357733002 .

Cr-Commit-Position: refs/heads/master@{#14357}
2016-09-22 16:52:30 +00:00
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