fix the huber loss compile issue on windows test=develop

paddle/fluid/operators/huber_loss_op.h

@@ -105,14 +105,16 @@ class HuberLossGradKernel : public framework::OpKernel<T> {
       out0->mutable_data<T>(context.GetPlace());
       auto x_grad = EigenVector<T>::Flatten(*out0);
       x_grad.device(place) =
-          out_grad * residual.unaryExpr(HuberLossBackward<T>(delta, -1.0));
+          residual.unaryExpr(HuberLossBackward<T>(delta, -1.0));
+      x_grad.device(place) = out_grad * x_grad;
     }
 
     if (out1) {
       out1->mutable_data<T>(context.GetPlace());
       auto y_grad = EigenVector<T>::Flatten(*out1);
       y_grad.device(place) =
-          out_grad * residual.unaryExpr(HuberLossBackward<T>(delta, 1.0));
+          residual.unaryExpr(HuberLossBackward<T>(delta, 1.0));
+      y_grad.device(place) = out_grad * y_grad;
     }
   }
 };