Fixed a missed initialization (found by valgrind FYI bot).
Fixed a missed initialization (found by valgrind FYI bot).

http://webrtc-cb-linux-master.cbf.corp.google.com:8011/builders/LinuxLargeTests/builds/327/steps/memory%20test%3A%20memcheck_voe_auto_test/logs/stdio

BUG=
TEST=Reproduced valgrind error, verified gone after fixing.

Review URL: https://webrtc-codereview.appspot.com/1008005

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@3318 4adac7df-926f-26a2-2b94-8c16560cd09d

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