Remove spurious reference to self. Remove debugging code.

setuptools/tests/py26compat.py

@@ -20,9 +20,8 @@ def _tarfile_open_ex(*args, **kwargs):
 	Extend result as a context manager.
 	"""
 	res = tarfile.open(*args, **kwargs)
-	res.__exit__ = lambda exc_type, exc_value, traceback: self.close()
+	res.__exit__ = lambda exc_type, exc_value, traceback: res.close()
 	res.__enter__ = lambda: res
 	return res
 
 tarfile_open = _tarfile_open_ex if sys.version_info < (2,7) else tarfile.open
-tarfile_open = _tarfile_open_ex