Fix div-by-0 in NetEq's StatisticsCalculator

webrtc/modules/audio_coding/neteq/statistics_calculator.cc

Index: webrtc/modules/audio_coding/neteq/statistics_calculator.cc
diff --git a/webrtc/modules/audio_coding/neteq/statistics_calculator.cc b/webrtc/modules/audio_coding/neteq/statistics_calculator.cc
index 8f873762c51c7063ffdd700b013e42efcb71611c..88b771098d94c6b50d2b334222f9f28ac013ebf4 100644
--- a/webrtc/modules/audio_coding/neteq/statistics_calculator.cc
+++ b/webrtc/modules/audio_coding/neteq/statistics_calculator.cc
@@ -95,7 +95,7 @@ void StatisticsCalculator::PeriodicUmaAverage::RegisterSample(int value) {
 }
 
 int StatisticsCalculator::PeriodicUmaAverage::Metric() const {
-  return static_cast<int>(sum_ / counter_);
+  return counter_ == 0 ? 0 : static_cast<int>(sum_ / counter_);
 }
 
 void StatisticsCalculator::PeriodicUmaAverage::Reset() {