logging errors when files have non-unicode character file names

[armijnhemel]

Error with Python's testtar.tar archive:

$ python3 bang-scanner -f /tmp/testtar.tar
--- Logging error ---
Traceback (most recent call last):
  File "/usr/lib64/python3.9/logging/__init__.py", line 1082, in emit
    stream.write(msg + self.terminator)
UnicodeEncodeError: 'utf-8' codec can't encode characters in position 50-56: surrogates not allowed
Call stack:
  File "/home/armijn/tmp/binaryanalysis-ng/src/bang-scanner", line 414, in <module>
    main(sys.argv)
  File "/home/armijn/tmp/binaryanalysis-ng/src/bang-scanner", line 294, in main
    process.start()
  File "/usr/lib64/python3.9/multiprocessing/process.py", line 121, in start
    self._popen = self._Popen(self)
  File "/usr/lib64/python3.9/multiprocessing/context.py", line 224, in _Popen
    return _default_context.get_context().Process._Popen(process_obj)
  File "/usr/lib64/python3.9/multiprocessing/context.py", line 277, in _Popen
    return Popen(process_obj)
  File "/usr/lib64/python3.9/multiprocessing/popen_fork.py", line 19, in __init__
    self._launch(process_obj)
  File "/usr/lib64/python3.9/multiprocessing/popen_fork.py", line 71, in _launch
    code = process_obj._bootstrap(parent_sentinel=child_r)
  File "/usr/lib64/python3.9/multiprocessing/process.py", line 315, in _bootstrap
    self.run()
  File "/usr/lib64/python3.9/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/home/armijn/tmp/binaryanalysis-ng/src/ScanJob.py", line 694, in processfile
    scanjob.check_entire_file(unpacker)
  File "/home/armijn/tmp/binaryanalysis-ng/src/ScanJob.py", line 556, in check_entire_file
    log(logging.DEBUG, "TRYING %s %s at offset: 0" %
  File "/home/armijn/tmp/binaryanalysis-ng/src/banglogging.py", line 7, in log
    logging.log(level, message)
Message: 'TRYING testtar.tar-0x00000000-tar-1/ustar/umlauts-\udcc4\udcd6\udcdc\udce4\udcf6\udcfc\udcdf script at offset: 0'