RTEMS | signal() should return SIG_ERR on error (!406)

[yang zhang (@yang.zhang)]

yang zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/406

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




## Summary

As described in the signal posix manual, `signal()` returns the previous value of the signal handler, or `SIG_ERR` on error.  In the event of an error, `errno` is set to indicate the cause.

So we should check the return code of `sigaction()`, and return the appropriate value.
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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/406
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