Description of problem:
Trying to run rpmlint on an SRPM or RPM package throws this error.

Version-Release number of selected component:
rpmlint-1.9-8.fc27

Additional info:
reporter:       libreport-2.9.1
cmdline:        /usr/bin/python3 -ttOu /usr/bin/rpmlint /home/jsmith/Build/RPMS/x86_64/mraa-1.5.1-3.fc27.x86_64.rpm /home/jsmith/Build/RPMS/x86_64/python3-iio-1.5.1-3.fc27.x86_64.rpm
crash_function: b2s
exception_type: AttributeError
executable:     /usr/bin/rpmlint
kernel:         4.11.0-0.rc2.git1.1.fc27.x86_64
runlevel:       N 5
type:           Python3
uid:            1975

Truncated backtrace:
Pkg.py:48:b2s:AttributeError: 'str' object has no attribute 'decode'

Traceback (most recent call last):
  File "/usr/bin/rpmlint", line 371, in <module>
    main()
  File "/usr/bin/rpmlint", line 160, in main
    runChecks(pkg)
  File "/usr/bin/rpmlint", line 217, in runChecks
    check.check(pkg)
  File "/usr/share/rpmlint/AbstractCheck.py", line 50, in check
    return self.check_binary(pkg)
  File "/usr/share/rpmlint/DistributionCheck.py", line 40, in check_binary
    for fname in pkg.files():
  File "/usr/share/rpmlint/Pkg.py", line 611, in files
    self._gatherFilesInfo()
  File "/usr/share/rpmlint/Pkg.py", line 721, in _gatherFilesInfo
    pkgfile.magic = b2s(_magic.descriptor(fd))
  File "/usr/share/rpmlint/Pkg.py", line 48, in b2s
    return b.decode(errors='replace')
AttributeError: 'str' object has no attribute 'decode'

Local variables in innermost frame:
b: 'data'