RTEMS | assert node->previous==NULL in chain_is_node_off_chain() (!871)

[Dhruva P V (@Dhrulian)]

Dhruva P V created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/871

Project:Branches: Dhrulian/rtems:fixing-chain-off to rtems/rtos/rtems:main
Author:   Dhruva P V




## Fixing the function "`_Chain_Is_node_off_chain()"`.(#4812)

In the previous code , the function returned true when node-\>next == NULL, but did not verify that node-\>previous was also NULL.

in the updated code the code implements:

* Return `true` when `node->next == NULL`, as before, and assert that `node->previous == NULL` using `_Assert()`.
* If node-\>next != NULL, the function returns false indicating that the node is on a chain.

The changes address the issue #4812 

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/871
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