[docs] [issue17380] initproc return value is unclear

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

The return value for error conditions should be -1.

- typeobject.c checks with "< 0"
- in _iomodule.c, there is "== -1"
- and pygobject/gobject/gobjectmodule.c just does::
    if (...tp_init(...))
        PyErr_Print();

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nosy: +amaury.forgeotdarc

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17380>
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