[Bug c/111730] erroneous alloc-size-larger-than warning with -O1

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111730

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
You might want to add a check that x is not negative and I suspect that will
fix the warning.