[LTP] lib/tst_uid: Remove spurious TERRNO from tst_get_free_gid success path

[linuxtestproject.agent@gmail.com]

Hi Wei,

On Mon, Aug 31, 2026, Wei Gao wrote:
> lib/tst_uid: Remove spurious TERRNO from tst_get_free_gid success path

Verdict - Reviewed

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