Segfault in exif_thumbnail when not dealing with a real file

### Description

The following code:

```php
<?php
$stream = popen('echo 1; echo 2; rm ' . escapeshellarg($tempnam), 'r');
$fusion = proc_open(
'sed "s/^/proc open stdin:/"',
[
0 => $stream,
],
$pipes,
);
exif_thumbnail($stream, $pipes, $stream, $pipes);
```

### PHP Version

nightly

### Operating System

ubuntu 22.04