[Python] S3FileSystem equals None causes bus error

### Describe the bug, including details regarding any error messages, version, and platform.

**Version:** `pyarrow==13.0.0`


**Repro script:**
```python
import pyarrow.fs

fs = pyarrow.fs.S3FileSystem()
fs != None
```

**Output:**
```
[1]    77091 bus error  python
```

I can do `fs is not None` as a workaround for now.

### Component(s)

Python