PacketBuffer now correctly cast sequence numbers to uint16_t.

webrtc/modules/video_coding/packet_buffer.cc

Index: webrtc/modules/video_coding/packet_buffer.cc
diff --git a/webrtc/modules/video_coding/packet_buffer.cc b/webrtc/modules/video_coding/packet_buffer.cc
index 03aeb5a4a9691e7fd867aada0b97628e272fd71c..42fa8a85959c96d7afa0d9d49423bbb627cb7e26 100644
--- a/webrtc/modules/video_coding/packet_buffer.cc
+++ b/webrtc/modules/video_coding/packet_buffer.cc
@@ -187,7 +187,7 @@ bool PacketBuffer::PotentialNewFrame(uint16_t seq_num) const {
   if (!sequence_buffer_[prev_index].used)
     return false;
   if (sequence_buffer_[prev_index].seq_num !=
-      sequence_buffer_[index].seq_num - 1) {
+      static_cast<uint16_t>(sequence_buffer_[index].seq_num - 1)) {
     return false;
   }
   if (sequence_buffer_[prev_index].continuous)