henrik.lundin e594213a2b Fix div-by-0 in NetEq's StatisticsCalculator
If a StatisticsCalculator::PeriodicUmaAverage object was created and
then deleted without any samples being logged, the destructor would call
the Metric() method, which calculated sum_/counter_. However, with no
samples logged, counter_ is 0.

This was found and verified using UBSan tests; see the bug for more info.

BUG=webrtc:5490
R=ivoc@webrtc.org

Review URL: https://codereview.webrtc.org/1678773003

Cr-Commit-Position: refs/heads/master@{#11534}
2016-02-09 08:36:02 +00:00
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