[Bug c/81453] relational expression involving null pointer not diagnosed with -Wall

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81453

--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
The name -Wordered-pointer-comparison was suggested for this warning here: 
https://gcc.gnu.org/ml/gcc-patches/2007-01/msg00608.html