RTEMS | GRLIB: Fix Coverity issues (!256)

[Matteo Concas (@matteo.concas)]

Matteo Concas created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/256

Project:Branches: matteo.concas/rtems-coverity:main to rtems/rtos/rtems:main
Author:   Matteo Concas




## Summary
Gaisler was asked to fix 8 issues found by Coverity scans.
Below is a list of the issues along with the actions taken:
- CID 1399762: False Positive, no action taken.
- CID 1399764: Dead code removed.
- CID 1399770: Dead code removed.
- CID 1399772: False Positive, no action taken.
- CID 1399774: Bitwise and operation on non-shifted bit position, fixed.
- CID 1399775: SLINK specification says that there are 3 IO cards capable of transmitting data but they can take addresses from 0 to 3. 
  Due to this, we need to have 4 queues instead of just 3. This is intentional, no action taken.
- CID 1399778: Evaluation order violation, split operation over two lines.
- CID 1399782: Evaluation order violation, split operation over two lines.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/256
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