Fixing a bug in expand_rate calculation for stereo signal.
Fixing a bug in expand_rate calculation for stereo signal.

BUG=
R=henrik.lundin@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/41849004

git-svn-id: 03ae4fbe531b1eefc9d815f31e49022782c42458@8307 4adac7df-926f-26a2-2b94-8c16560cd09d

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