minor py2 cleanup for sys.stderr.buffer
minor py2 cleanup for sys.stderr.buffer

pre-commit/pre-commit,pre-commit/pre-commit,pre-commit/pre-commit,pre-commit/pre-commit,pre-commit/pre-commit,pre-commit/pre-commit,pre-commit/pre-commit,pre-commit/pre-commit,pre-commit/pre-commit,pre-commit/pre-commit,pre-commit/pre-commit