stdlib: resolve a double lock init issue after fork [BZ #32994]

[Davide Cavalca]

On 2025-06-14 11:51, Florian Weimer wrote:
> Sorry, can you move the lock definition into __abort_fork_reset_child?
> Without the static, so (, lock).  I think GCC will then turn the memcpy
> call into a memset.  We don't actually need the global variable.

Thanks, updated with this change, tests still pass with no change.

Cheers
Davide
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