[Bug c/16351] NULL dereference warnings

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=16351

--- Comment #56 from Martin Sebor <msebor at gcc dot gnu.org> ---
I'd say any warning option with more than just a handful of pr's against it
would benefit from having a meta-bug.