Fail to compile with gcc 7.2

Check build log /limagroup/lima/-/jobs/11424

Here the invalid code:

/opt/conda/conda-bld/lima_1532591131667/work/camera/slsdetector/src/SlsDetectorCPUAffinity.cpp:296:17: error: cannot convert 'std::ofstream {aka std::basic_ofstream<char>}' to 'bool' in initialization
  bool file_ok = rps_file;

But there are also some potential buffer overruns reported that are worth a look I think.