[LTP] futex: Add error coverage tests for wait, wake and cmp_requeue

[linuxtestproject.agent@gmail.com]

Hi Michael,

On Sun, 19 Apr 2026, Michael Menasherov wrote:
> futex: Add error coverage tests for wait, wake and cmp_requeue

> +++ b/testcases/kernel/syscalls/futex/futex_cmp_requeue03.c (new)
> +++ b/testcases/kernel/syscalls/futex/futex_wait06.c        (new)
> +++ b/testcases/kernel/syscalls/futex/futex_wait07.c        (new)
> +++ b/testcases/kernel/syscalls/futex/futex_wake05.c        (new)

Each of these is an independent test case. LTP policy requires at most
one new test case per commit — please split into four separate patches.

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