Calling curl_errno() before closing the conextion trhows an error
Calling curl_errno() before closing the conextion trhows an error

An example here:

```text
Amp render failure: Cannot inline the amp-runtime CSS in unspecified version into <style amp-runtime="">: ErrorException: curl_errno(): supplied resource is not a valid cURL handle resource in /vendor/ampproject/amp-toolbox/src/RemoteRequest/CurlRemoteGetRequest.php:136
```

See for reference: [https://stackoverflow.com/questions/19442999/getting-curl-error-2-is-not-a-valid-curl-handle-resource-while-fetching-all-u](https://stackoverflow.com/questions/19442999/getting-curl-error-2-is-not-a-valid-curl-handle-resource-while-fetching-all-u)

ampproject/amp-toolbox-php,ampproject/amp-toolbox-php