[Bug c/80806] gcc does not warn if local array is memset only

[prathamesh3492 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80806

--- Comment #5 from prathamesh3492 at gcc dot gnu.org ---
Patch posted for review:
https://gcc.gnu.org/ml/gcc-patches/2017-05/msg01493.html