[LTP] listmount04: Allow both EINVAL and EBADF for BEFORE_6_17_9 case

[linuxtestproject.agent@gmail.com]

Hi Wake,

On 2026-04-30, Wake Liu wrote:
> listmount04: Allow both EINVAL and EBADF for BEFORE_6_17_9 case

> Change-Id: If5b138e64b7c3d8434eea180dd6adc845db44f42

Please drop the Change-Id tag before sending to the mailing list; it is a
Gerrit internal tracker and does not belong in upstream LTP patches.

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