[Bug c/87367] GCC gives false warning on -Wnull-dereference when using -O2

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87367

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---

    copy->next = list_new();

You dont check the return value here.