GCC 15 warning for GCM implementation

[Collin Funk]

NIIBE Yutaka via Gcrypt-devel <gcrypt-devel at gnupg.org> writes:

> I think that new code has clean semantics and read easier (computing
> N only when the condition holds).
>
> Any suggestions are welcome.

The patch looks reasonable to me, but FYI I am not able to see the
warning with:

    $ uname -a
    Linux fedora 6.15.4-200.fc42.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Jun 27 15:32:46 UTC 2025 x86_64 GNU/Linux
    $ gcc --version | sed 1q
    gcc (GCC) 15.1.1 20250521 (Red Hat 15.1.1-2)

Collin
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