[issue31897] RecursionError in plistlib.loads

[Ned Williamson]

Ned Williamson <nedwilliamson at gmail.com> added the comment:

```
import plistlib
dat = b'AAAAAAAAAAAwAAA\xc9AAAAAAAAAAAAA\x9cAAAAAAAAAAAAAAAAAA\x00\x00\x00\x00\x00\x00\x00\x0b\x00\x00AAAAA\x04\xb2\xaaAAAAAA'
plistlib.loads(dat, fmt=plistlib.FMT_BINARY)
```
raises
```
Traceback (most recent call last):
  File "repro.py", line 3, in <module>
    plistlib.loads(dat, fmt=plistlib.FMT_BINARY)
  File "/usr/lib/python3.5/plistlib.py", line 1006, in loads
    fp, fmt=fmt, use_builtin_types=use_builtin_types, dict_type=dict_type)
  File "/usr/lib/python3.5/plistlib.py", line 997, in load
    return p.parse(fp)
  File "/usr/lib/python3.5/plistlib.py", line 621, in parse
    self._fp.seek(offset_table_offset)
OverflowError: Python int too large to convert to C ssize_t
```

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31897>
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