RTEMS | Need to invalid posix message queue object id when delete mq (!364)

[yang zhang (@yang.zhang)]

yang zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/364

Project:Branches: yang.zhang/rtems:invalidate_msgq_id to rtems/rtos/rtems:main
Author:   yang zhang




## Summary

After unlink and close message queue, when need to delete mq,
should also invalid mq object id.

Otherwise, after mq_open, mq_unlink, mq_close，if call mq_close again,
although the return code is -1, errno is EBADF，it's the wrong return path.
When call _POSIX_Message_queue_Get in mq_close， the the_mq still exists 
which shold not happen, because the the_mq->open_count is zero, so it seems
to be fine.

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