RTEMS | testsuites/psxtests/psxmsgq01: Fix timeval subtraction (!1325)

[Yang Zhang (@Chloe)]

Yang Zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1325

Project:Branches: Chloe/rtems:fix-psxmsgq01-timeval-subtraction to rtems/rtos/rtems:main
Author:   Yang Zhang



## Summary

This patch fixes the timeval subtraction logic in psxmsgq01/init.c which previously failed to borrow from the seconds component when the microsecond difference was negative.

This bug resulted in negative microsecond values and an off-by-one incorrect seconds count during timed queue verifications.

Additionally, this patch removes the associated "FIXME: This is wrong." comment.

## Generative AI

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1325
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