[Bug c/102936] Excessive warnings about passing NULL for an "%s" specifier

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102936

--- Comment #1 from Andreas Schwab <sch...@linux-m68k.org> ---
In varargs context no implicit type conversions are performed.  A pointer to
void may have a different representation than a pointer to char.