message: Update encode_proto_op.cc
  Initialise the message_count
diff: @@ -516,7 +516,7 @@ class EncodeProtoOp : public OpKernel {
  // Check the arguments for consistency.
  TensorShape common_prefix;
  - int message_count;
  + int message_count = 0;
  for (int i = 0; i < field_descs_.size(); i++) {
  const Tensor& v = values[i];
  