[LTP] gethostname02: Accept EOVERFLOW on alpha

[linuxtestproject.agent@gmail.com]

Hi panzhe,

On Wed, 03 Jun 2026 09:49:33 +0800, panzhe wrote:
> gethostname02: Accept EOVERFLOW on alpha

All good. Reviewed.

Pre-existing issues noticed in the surrounding code (not introduced
by this patch):

- testcases/kernel/syscalls/gethostname/gethostname02.c in
  verify_gethostname() -- if the hostname is empty, `real_length`
  is 0 and `gethostname(hostname, real_length - 1)` passes -1 as
  len, which returns EINVAL rather than ENAMETOOLONG or EOVERFLOW.

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