[Bug c/79479] -Woverflow false alarm in unreachable expression

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79479

--- Comment #4 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I might, but the front ends, where the warning is taking place, can't see that
the function always returns early.