[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_coding/neteq/neteq_impl.cc

Index: webrtc/modules/audio_coding/neteq/neteq_impl.cc
diff --git a/webrtc/modules/audio_coding/neteq/neteq_impl.cc b/webrtc/modules/audio_coding/neteq/neteq_impl.cc
index 171448808e94298bd38916eab473413aa0407a92..08af919e21d60d727bb06874af336ea14e63b842 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_impl.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_impl.cc
@@ -159,7 +159,7 @@ int NetEqImpl::InsertSyncPacket(const WebRtcRTPHeader& rtp_header,
 }
 
 int NetEqImpl::GetAudio(size_t max_length, int16_t* output_audio,
-                        size_t* samples_per_channel, int* num_channels,
+                        size_t* samples_per_channel, size_t* num_channels,
                         NetEqOutputType* type) {
   CriticalSectionScoped lock(crit_sect_.get());
   LOG(LS_VERBOSE) << "GetAudio";
@@ -709,7 +709,7 @@ int NetEqImpl::InsertPacketInternal(const WebRtcRTPHeader& rtp_header,
 int NetEqImpl::GetAudioInternal(size_t max_length,
                                 int16_t* output,
                                 size_t* samples_per_channel,
-                                int* num_channels) {
+                                size_t* num_channels) {
   PacketList packet_list;
   DtmfEvent dtmf_event;
   Operations operation;
@@ -837,7 +837,7 @@ int NetEqImpl::GetAudioInternal(size_t max_length,
   size_t samples_from_sync =
       sync_buffer_->GetNextAudioInterleaved(num_output_samples_per_channel,
                                             output);
-  *num_channels = static_cast<int>(sync_buffer_->Channels());
+  *num_channels = sync_buffer_->Channels();
   LOG(LS_VERBOSE) << "Sync buffer (" << *num_channels << " channel(s)):" <<
       " insert " << algorithm_buffer_->Size() << " samples, extract " <<
       samples_from_sync << " samples";