[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/flake8/checker.py

@@ -71,7 +71,7 @@ def _mp_init(argv: Sequence[str]) -> None:
 
     try:
         # for `fork` this'll already be set
-        _mp_plugins, _mp_options # noqa: B018
+        _mp_plugins, _mp_options  # noqa: B018
     except NameError:
         plugins, options = parse_args(argv)
         _mp_plugins, _mp_options = plugins.checkers, options