Subject: str_casefold: fix typo in error message

From: Chao Li <[email-masked]>
Date: Tue, 13 Jan 2026 10:09:06 +0800

Hi Hacker,

Found this issue while reviewing the other patch. That looks like a
copy-paste error from the initial commit.

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/