[Bug middle-end/79257] spurious -Wformat-overflow=1 warning with -O2 and sanitizer

[catwell-gcc at catwell dot info]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79257

--- Comment #6 from Pierre Chapuis <catwell-gcc at catwell dot info> ---
(Note this is my first time reporting something to GCC, if you think I should
have opened a new ticked because it may be a slightly different bug please tell
me.)