[issue9403] cElementTree: replace PyObject_DEL() by Py_DECREF() to fix a crash in pydebug mode

[Florent Xicluna]

Changes by Florent Xicluna <florent.xicluna at gmail.com>:


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components: +Extension Modules, XML -Library (Lib)
nosy: +effbot, flox
type:  -> crash

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9403>
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