[Bug fortran/67588] module.c heap use after free

[pault at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67588

--- Comment #6 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to Vittorio Zecca from comment #5)
> I believe that
> 
> use_list = module_list;
> 
> at line module.c:805 is useless and can be expunged.

I don't think so.... Up to that point, use_list is set to point to the end of
the module_list by line 760. It then has to be initialized for the loop at 806.

Cheers

Paul