PyAPI: avoid redundant PyLong_AsLong call

Assigning to an RNA array converted from Python to C twice.

source/blender/python/intern/bpy_rna.c

@@ -2712,7 +2712,7 @@ static PyObject *pyrna_prop_array_subscript(BPy_PropertyArrayRNA *self, PyObject
 		Py_ssize_t i = PyNumber_AsSsize_t(key, PyExc_IndexError);
 		if (i == -1 && PyErr_Occurred())
 			return NULL;
-		return pyrna_prop_array_subscript_int(self, PyLong_AsLong(key));
+		return pyrna_prop_array_subscript_int(self, i);
 	}
 	else if (PySlice_Check(key)) {
 		Py_ssize_t step = 1;