RTEMS | sigtimedwait() only clear a signal when EINTR (!415)

[yang zhang (@yang.zhang)]

yang zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/415

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




## Summary

When a thread is unblocked from `sigtimedwait`, it maybe `ETIMEOUT` or
`EINTR`. If `ETIMEOUT`, there is no pending signals, never and is not
necessary to call `_POSIX_signals_Clear_signals` because of `the_info->si_signo`
is `-1`.

Should validate the signal passed into `_POSIX_signals_Clear_signals`.
For example, i test on `aarch64/zynqmp_qemu`, when `signo` is `-1`, after
`signo_to_mask(signo)` which using `lsl` instruction, the `mask` is `0x40000000`,
so the `signo` unexpectedly becomed `31` from `-1`.


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