Commit43cd7aa

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gh-120754: Fix memory leak in FileIO.__init__() (#124225)

Free 'self->stat_atopen' before assigning it, sinceio.FileIO.__init__() can be called multiple times manually(especially by test_io).

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Original file line number	Diff line number	Diff line change
`@@ -457,6 +457,7 @@ _io_FileIO___init___impl(fileio self, PyObject nameobj, const char *mode,`
`457`	`457`	`#endif`
`458`	`458`	`}`
`459`	`459`
	`460`	`+PyMem_Free(self->stat_atopen);`
`460`	`461`	`self->stat_atopen=PyMem_New(struct_Py_stat_struct,1);`
`461`	`462`	`if (self->stat_atopen==NULL) {`
`462`	`463`	`PyErr_NoMemory();`

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