Fix (export): fix interface for QCDQDecoupledWeightQuantProxyHandlerM…

…ixin (Xilinx#870)

src/brevitas/export/common/handler/qcdq.py

@@ -236,7 +236,8 @@ class QCDQCastDecoupledWeightQuantProxyHandlerMixin(QCDQCastWeightQuantProxyHand
     def symbolic_execution(self, x: Tensor):
         out, scale, zero_point, bit_width = super().symbolic_execution(x)
         # Return post-rounding scale and zero-point in place of pre-rounding as a placeholder
-        return out, scale, zero_point, scale, zero_point, bit_width
+        # The order of arguments must match the order in the forward method of DecoupledRescalingIntQuant
+        return out, scale, zero_point, bit_width, scale, zero_point
 
 
 class QCDQCastDecoupledWeightQuantWithInputProxyHandlerMixin(