Wire up rtcp xr target bitrate on receive side.

webrtc/test/fuzzers/rtcp_receiver_fuzzer.cc

Index: webrtc/test/fuzzers/rtcp_receiver_fuzzer.cc
diff --git a/webrtc/test/fuzzers/rtcp_receiver_fuzzer.cc b/webrtc/test/fuzzers/rtcp_receiver_fuzzer.cc
index 8678d11dcfe633deed67b64df446338d91da3a25..b8ab9b9e540b0ececf05c83c20b8c0032e02484b 100644
--- a/webrtc/test/fuzzers/rtcp_receiver_fuzzer.cc
+++ b/webrtc/test/fuzzers/rtcp_receiver_fuzzer.cc
@@ -29,7 +29,7 @@ void FuzzOneInput(const uint8_t* data, size_t size) {
   SimulatedClock clock(1234);
 
   RTCPReceiver receiver(&clock, false, nullptr, nullptr, nullptr, nullptr,
-                        &rtp_rtcp_module);
+                        nullptr, &rtp_rtcp_module);
 
   receiver.IncomingPacket(data, size);
 }