[Bug bootstrap/97622] ubsan ' unterminated quote character ''' in format

[euloanty at live dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97622

--- Comment #3 from fdlbxtqi <euloanty at live dot com> ---
(In reply to Jakub Jelinek from comment #1)
> Why do you think it is a bug?
> Yes, it prints the opening quote, then
>       while (deref_depth-- > 0)
>         pp_star (&pretty_name);
> prints some * characters and finally
>       pp_quote (&pretty_name);
> prints the closing '

Because the compiler warns about it.