[LTP] futex_wait06: Add EFAULT error coverage test

[linuxtestproject.agent@gmail.com]

Hi Michael,

On Wed, 27 May 2026 12:26:15 +0300, Michael Menasherov wrote:
> futex_wait06: Add EFAULT error coverage test
> futex_wait07: Add EINTR error coverage test
> futex_wake05: Add EFAULT error coverage test
> futex_cmp_requeue03: Add EFAULT error coverage test

All good. Reviewed.

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