Get rid of utils.unused because it's unused

qutebrowser/utils/utils.py

@@ -860,11 +860,6 @@ def open_file(filename, cmdline=None):
     proc.start_detached(cmd, args)
 
 
-def unused(_arg):
-    """Function which does nothing to avoid pylint complaining."""
-    pass
-
-
 def expand_windows_drive(path):
     r"""Expand a drive-path like E: into E:\.
 

tests/unit/utils/test_utils.py

@@ -925,10 +925,6 @@ class TestOpenFile:
         m.assert_called_with(QUrl('file:///foo/bar'))
 
 
-def test_unused():
-    utils.unused(None)
-
-
 @pytest.mark.parametrize('path, expected', [
     ('E:', 'E:\\'),
     ('e:', 'e:\\'),