[libstdc++] [testsuite] avoid async.cc loss of precision [PR91486]

[Alexandre Oliva]

On Jul 29, 2024, Alexandre Oliva <oliva@adacore.com> wrote:

> -  auto status = f1.wait_for(wait_time);
> +  auto status __attribute__ (__unused__) = f1.wait_for(wait_time);

Sorry, it looks like I posted the patch before refreshing it.  Make it:

  +  auto status __attribute__ ((__unused__)) = f1.wait_for(wait_time);

(both occurrences were affected)

-- 
Alexandre Oliva, happy hacker            https://FSFLA.org/blogs/lxo/
   Free Software Activist                   GNU Toolchain Engineer
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