Allow H264 bitstream parser to fail gracefully

webrtc/common_video/h264/h264_common.cc

Index: webrtc/common_video/h264/h264_common.cc
diff --git a/webrtc/common_video/h264/h264_common.cc b/webrtc/common_video/h264/h264_common.cc
index fe55b02d2cc246bba59da20931d7ff73a1b38626..a9cc6a25e62882e8619ed627aeb9cefee67e248f 100644
--- a/webrtc/common_video/h264/h264_common.cc
+++ b/webrtc/common_video/h264/h264_common.cc
@@ -24,6 +24,7 @@ std::vector<NaluIndex> FindNaluIndices(const uint8_t* buffer,
   std::vector<NaluIndex> sequences;
   if (buffer_size < kNaluShortStartSequenceSize)
     return sequences;
+
   const size_t end = buffer_size - kNaluShortStartSequenceSize;
   for (size_t i = 0; i < end;) {
     if (buffer[i + 2] > 1) {