As of PHP 8.0.0, failing `zend_fetch_resource_ex()` throws a TypeError,
so we cannot simply skip non resources in the `$read`, `$write` and
`$except` arrays. Instead we bail out. Since these arrays are already
checked in `php_sock_array_to_fd_set()`, we remove the additional check
in `php_sock_array_from_fd_set()`.
