Fix lint errors.

osh/meta.py

@@ -5,7 +5,7 @@
Another "thin waist" of the interpreter.  It can be happen at compile time!

We are following the code <-> data pattern, and this is the "data" module.
id_kind and ASDL are the code.
id_kind and asdl are the "code" modules.

Usage:
  from osh.meta import Id, Kind, ast, ID_SPEC
@@ -14,12 +14,7 @@
from asdl import py_meta
from asdl import asdl_ as asdl

# These are metaprogramming libraries.  Everything can happen at compile time.
# Could move these to a dir like meta?  From meta import id_kind?  From meta
# import asdl?
from core import id_kind 
from osh import ast_

from core import util


@@ -84,7 +79,7 @@ def IdInstance(i):

types = _AsdlModule()
if 0:
  py_meta.MakeTypes(_asdl_module, ast, _type_lookup)
  py_meta.MakeTypes(_asdl_module, types, _type_lookup)
else:
  # Exported for the generated code to use
  TYPES_TYPE_LOOKUP = _type_lookup