[Bug c/78498] [7 Regression] valgrind conditional jump or move depends on uninitialised value(s) in format_type_warning

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78498

--- Comment #5 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch:
  https://gcc.gnu.org/ml/gcc-patches/2016-11/msg02937.html