RTEMS | cpukit/posix/src/pthreaddetach.c: fix pthreaddetach issue (!622)

[坤 唐 (@tangkun)]

坤 唐 created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/622

Project:Branches: tangkun/rtems:pthread_detach_test to rtems/rtos/rtems:main
Author:   坤 唐




## Summary

cpukit/posix/src/pthreaddetach.c: fix pthreaddetach issue

When calling pthread_detach on a thread which is already detached, it should return EINVAL.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/622
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