RTEMS | cpukit/rtems/src: Guard against zero-length in rtems_port_create (!1349)

[Avi Weiss (@thnkslprpt)]

Avi Weiss created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1349

Project:Branches: thnkslprpt/rtems:fix-5649-protect-against-zero-length-in-port-create to rtems/rtos/rtems:main
Author:   Avi Weiss



## Summary

Fixes #5649

Adds a guard against zero-length inputs to `rtems_port_create`.  
I used the same form as the `rtems_partition_create` guards.  
Without it, it underflows and is created with length - 1 (i.e. `UINT32_MAX`)

Follow on commit corrects a couple typos in the associated test file.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1349
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