Initialized a variable to fix -Wmaybe-uninitialized warning.

modules/rtp_rtcp/source/rtp_sender.cc

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 704 matching lines @@
                             const RTPVideoTypeHeader* rtpTypeHdr)
 {
     {
         // Drop this packet if we're not sending media packets
         CriticalSectionScoped cs(_sendCritsect);
         if (!_sendingMedia)
         {
             return 0;
         }
     }
-    RtpVideoCodecTypes videoType;
+    RtpVideoCodecTypes videoType = kRtpNoVideo;
     if(CheckPayloadType(payloadType, videoType) != 0)
     {
         WEBRTC_TRACE(kTraceError, kTraceRtpRtcp, _id, "%s invalid argument failed to find payloadType:%d", __FUNCTION__, payloadType);
         return -1;
     }
     // update keepalive so that we don't trigger keepalive messages while sending data
     _keepAliveLastSent = _clock.GetTimeInMS();
 
     if(_audioConfigured)
     {
@@ skipping 1006 matching lines @@
 
 {
     if(_audioConfigured)
     {
         return -1;
     }
     return _video->SetFECUepProtection(keyUseUepProtection,
                                        deltaUseUepProtection);
 }
 } // namespace webrtc