message: fixup! sigemptyset and sigaddset
diff: @@ -66,7 +66,9 @@ pub unsafe extern "C" fn sigaction(sig: c_int, act: *const sigaction, oact: *mut
  #[no_mangle]
  pub extern "C" fn sigaddset(set: *mut sigset_t, mut signo: c_int) -> c_int {
  if signo <= 0 || signo as usize > NSIG {
  + unsafe {
  platform::errno = errno::EINVAL;
  + }
  return -1;
  }
  