RTEMS | pthread_sigmask should return error number when fail (!546)

[yang zhang (@yang.zhang)]

yang zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/546

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




## Summary

According to the Posix specification:
Upon successful completion pthread_sigmask() shall return 0;
otherwise, it shall return the corresponding error number.

So, pthread_sigmask should return errno not -1 when fail.

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