RTEMS | Backport pthread_sigmask return fixup to 6 branch (#5302)

[Kinsey Moore (@opticron)]

Kinsey Moore created an issue: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5302



The following discussion from !546 should be addressed:

- [ ] @gedare started a [discussion](https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/546#note_126561):  (+2 comments)

    > [https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_sigmask.html](https://pubs.opengroup.org/onlinepubs/9799919799/)
    > 
    > Upon successful completion, pthread_sigmask() shall return 0; otherwise, it shall return the corresponding error number.
    > 
    > @joel do you want to backport this ?

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5302
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