[Bug libstdc++/98749] No precondition checks in , and

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98749

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
r15-4209-gf5021ce9aa6be5 added a check to std::latch::count_down, but with a
copy&paste error so that the same check is done twice. Oops.