[Bug middle-end/85902] -Wstringop-truncation false-positive

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85902

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
The last test case is no longer diagnosed either by GCC 8 or the current trunk.
 The first two still are.