Fix uninitialized value msan failure

Bug: 391445226
Change-Id: I16ee2a97fb106d2e2560991cd1bfbe92913949fa
Reviewed-on: https://chromium-review.googlesource.com/c/openscreen/+/6917871
Reviewed-by: Muyao Xu <muyaoxu@google.com>
Reviewed-by: Jordan Bayles <jophba@chromium.org>
Commit-Queue: Taesun Yeoum <taesuny@google.com>
diff --git a/cast/streaming/public/statistics.h b/cast/streaming/public/statistics.h
index 86e6a88..372bd64 100644
--- a/cast/streaming/public/statistics.h
+++ b/cast/streaming/public/statistics.h
@@ -159,16 +159,16 @@
                  static_cast<size_t>(HistogramType::kNumTypes)>;
 
   // The current audio statistics.
-  StatisticsList audio_statistics;
+  StatisticsList audio_statistics = {};
 
   // The current audio histograms.
-  HistogramsList audio_histograms;
+  HistogramsList audio_histograms = {};
 
   // The current video statistics.
-  StatisticsList video_statistics;
+  StatisticsList video_statistics = {};
 
   // The current video histograms.
-  HistogramsList video_histograms;
+  HistogramsList video_histograms = {};
 
   Json::Value ToJson() const;
   std::string ToString() const;