Issue created by Avi Weiss: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5649



## Summary
`rtems_port_create` should protect against zero length, similar to how 
`rtems_partition_create` does:  
```c
rtems_status_code rtems_partition_create(
  rtems_name      name,
  void           *starting_address,
  uintptr_t       length,
  size_t          buffer_size,
  rtems_attribute attribute_set,
  rtems_id       *id
)
{
  Partition_Control *the_partition;

  if ( !rtems_is_name_valid( name ) ) {
    return RTEMS_INVALID_NAME;
  }

  if ( id == NULL ) {
    return RTEMS_INVALID_ADDRESS;
  }

  if ( starting_address == NULL ) {
    return RTEMS_INVALID_ADDRESS;
  }

  if ( length == 0 ) {
    return RTEMS_INVALID_SIZE;
  }
...
```

## Steps to reproduce
Code review

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5649
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