[Bug c/72858] incorrect fixit hints in -Wformat diagnostics

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72858

--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch posted here:
https://gcc.gnu.org/ml/gcc-patches/2016-08/msg01053.html