RTEMS | cpukit: fix off-chain state checks and pointer clearing (!1067)

[Chandan U (@Chandanuvm)]

Chandan U created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1067

Project:Branches: Chandanuvm/rtems:chandan/issue-5491 to rtems/rtos/rtems:main
Author:   Chandan U



## Summary

cpukit: fix off-chain state checks and pointer clearing

Semaphore wait nodes store flags in the left part of previous. So \_Chain_Is_node_off_chain() is not safe in all semaphore paths. Use node-\>next == NULL where needed for semaphore wait nodes.

Also clear both previous and next when a node is set off chain. do this whenever chain remove/get paths before re-use.

Updates #5491 Closes #5491

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