[Bug c/86345] Likely false warning with -Wstringop-overflow and memset

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86345

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
As an aside, the warning first appeared with r260350 as a result of
improvements to switch statement handling.