[Bug c/72857] incorrect caret location in -Wformat for width and precision given by asterisk

[dmalcolm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72857

--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch: https://gcc.gnu.org/ml/gcc-patches/2016-08/msg00867.html