Method check_for_error

lib/fluxsource/fl2fluxsource.cc:71–75

private:
    void check_for_error(std::ifstream& ifs)
    {
        if (ifs.fail())
            error("FL2 read I/O error: {}", strerror(errno));
    }

private:
    const Fl2FluxSourceProto& _config;