RTEMS | cpukit/dev/io: Add NULL check to iodev (!1377)

[Aaron Nyholm (@eagleirony)]

Aaron Nyholm created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1377

Project:Branches: eagleirony/rtems:iodev-destroy-unregistered to rtems/rtos/rtems:main
Author:   Aaron Nyholm
Assignee: Aaron Nyholm


## Summary

cpukit/dev/io: Add NULL check to iodev

Added check to prevent NULL access in rtems_iodev_destory_unregistered.


## Generative AI
None.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1377
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