Commit726448e

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GH-93990: fix refcounting bug inadd_subclass intypeobject.c (GH-93989)

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Original file line number	Diff line number	Diff line change
`@@ -6671,8 +6671,11 @@ add_subclass(PyTypeObject base, PyTypeObject type)`
`6671`	`6671`	`PyObject*subclasses=base->tp_subclasses;`
`6672`	`6672`	`if (subclasses==NULL) {`
`6673`	`6673`	`base->tp_subclasses=subclasses=PyDict_New();`
`6674`		`-if (subclasses==NULL)`
	`6674`	`+if (subclasses==NULL) {`
	`6675`	`+Py_DECREF(key);`
	`6676`	`+Py_DECREF(ref);`
`6675`	`6677`	`return-1;`
	`6678`	`+ }`
`6676`	`6679`	`}`
`6677`	`6680`	`assert(PyDict_CheckExact(subclasses));`
`6678`	`6681`

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