[LTP] Fix Valgrind warnings in ioctl_pidfd02

[linuxtestproject.agent@gmail.com]

Hi Martin,

On Fri, 17 Apr 2026, Martin Cermak wrote:
> Fix Valgrind warnings in ioctl_pidfd02

The subject names ioctl_pidfd02, but the only changed file is
lib/tst_clone.c. Use the component prefix instead:

  lib/tst_clone: Fix clone() parent_tid argument when CLONE_PIDFD is used

> This patch also sets ARG4 and ARG5.

No Fixes: tag. Please add one in the trailer pointing to the commit that
introduced the 2-argument clone() fallback in tst_clone.c.

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