message: Check return status of reading environment variable
diff: @@ -233,8 +233,11 @@ Status GrpcServer::Init(const GrpcServerOptions& opts) {
  builder.SetMaxMessageSize(std::numeric_limits<int32>::max());
  bool reuse_port = false;
  - ReadBoolFromEnvVar("TF_GRPC_REUSE_PORT", false, &reuse_port)
  - .IgnoreError();
  + const Status status = ReadBoolFromEnvVar("TF_GRPC_REUSE_PORT", false,
  + &reuse_port);
  + if (!status.ok()) {
  + LOG(ERROR) << status.error_message();
  + }
  auto server_build_option = reuse_port ?
  std::unique_ptr<::grpc::ServerBuilderOption>(new ReusePortOption) :
  std::unique_ptr<::grpc::ServerBuilderOption>(new NoReusePortOption);
  