Fix for bwe with overhead on audio only calls.

webrtc/modules/congestion_controller/transport_feedback_adapter.cc

Index: webrtc/modules/congestion_controller/transport_feedback_adapter.cc
diff --git a/webrtc/modules/congestion_controller/transport_feedback_adapter.cc b/webrtc/modules/congestion_controller/transport_feedback_adapter.cc
index 7ffbe8d2da0f783b75cac8b5721b8dbfc76da258..c3d60fe35de94b0d11d4dc4620e6c92758f4646b 100644
--- a/webrtc/modules/congestion_controller/transport_feedback_adapter.cc
+++ b/webrtc/modules/congestion_controller/transport_feedback_adapter.cc
@@ -43,7 +43,8 @@ class PacketInfoComparator {
 TransportFeedbackAdapter::TransportFeedbackAdapter(
     Clock* clock,
     BitrateController* bitrate_controller)
-    : send_time_history_(clock, kSendTimeHistoryWindowMs),
+    : transport_overhead_bytes_per_packet_(0),
+      send_time_history_(clock, kSendTimeHistoryWindowMs),
       clock_(clock),
       current_offset_ms_(kNoTimestamp),
       last_timestamp_us_(kNoTimestamp),