bpo-40061: Fix a possible refleak in _asynciomodule.c (GH-19748)
tup should be decrefed in the unlikely event of a PyList_New() failure.
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@ -710,6 +710,7 @@ future_add_done_callback(FutureObj *fut, PyObject *arg, PyObject *ctx)
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else {
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fut->fut_callbacks = PyList_New(1);
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if (fut->fut_callbacks == NULL) {
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Py_DECREF(tup);
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return NULL;
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}
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