[Bug sanitizer/82869] c_associated does not always give false for null pointers

[james.s.spencer at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82869

--- Comment #11 from james.s.spencer at gmail dot com ---
(In reply to Janne Blomqvist from comment #10)
> Fixed now on the gcc-7 branch as well. Thanks James for reporting, and
> Martin for bisecting!

Thanks for the quick fix!