Make sure FEC packets aren't passed to the VCM with non-zero length.

BUG=902

Review URL: https://webrtc-codereview.appspot.com/843007

git-svn-id: http://webrtc.googlecode.com/svn/trunk@2840 4adac7df-926f-26a2-2b94-8c16560cd09d

src/modules/video_coding/main/source/video_coding_impl.cc

@@ -1178,6 +1178,12 @@ VideoCodingModuleImpl::IncomingPacket(const WebRtc_UWord8* incomingPayload,
                                     WebRtc_UWord32 payloadLength,
                                     const WebRtcRTPHeader& rtpInfo)
 {
+    if (incomingPayload == NULL) {
+      // The jitter buffer doesn't handle non-zero payload lengths for packets
+      // without payload.
+      // TODO(holmer): We should fix this in the jitter buffer.
+      payloadLength = 0;
+    }
     const VCMPacket packet(incomingPayload, payloadLength, rtpInfo);
     WebRtc_Word32 ret;
     if (_dualReceiver.State() != kPassive)

src/video_engine/vie_receiver.cc

@@ -137,7 +137,6 @@ WebRtc_Word32 ViEReceiver::OnReceivedPayloadData(
                                             packet_size,
                                             TickTime::MillisecondTimestamp(),
                                             compensated_timestamp);
-
   if (vcm_->IncomingPacket(payload_data, payload_size, *rtp_header) != 0) {
     // Check this...
     return -1;