RTEMS | testsuites/validation: fix setjmp UB (!773)

[Gedare Bloom (@gedare)]

Gedare Bloom created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/773

Project:Branches: gedare/rtems:5373-setjmp to rtems/rtos/rtems:main
Author:   Gedare Bloom
Assignee: Gedare Bloom
Reviewer: Joel Sherrill


## Summary

testsuites/validation: fix setjmp UB

Storing the return value of setjmp to a local variable is
undefined behavior.

Fixes #5373.


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Closes #5373

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/773
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