Make cypclass types always generate a temp for decrefing purpose

Cython/Compiler/ExprNodes.py

@@ -748,7 +748,7 @@ class ExprNode(Node):
         if not type.is_void:
             if type.is_pyobject:
                 type = PyrexTypes.py_object_type
-            elif not (self.result_is_used or type.is_memoryviewslice or self.is_c_result_required()):
+            elif not (type.is_cyp_class or self.result_is_used or type.is_memoryviewslice or self.is_c_result_required()):
                 self.temp_code = None
                 return
             self.temp_code = code.funcstate.allocate_temp(