[Bug tree-optimization/120526] false positive warning at -O1 -Wall on fprintf %s due to strtoimax not being marked as nonnull for the first argument

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120526

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Another workaround is to do:
```
  size = strtoimax (str, &end, 10);
  if (!str) __builtin_unreachable();
```