net: lantiq_etop: remove multiple assignments

Documentation/process/coding-style.rst says (in line 88)
"Don't put multiple assignments on a single line either."

This patch fixes the coding style issue reported by checkpatch.pl.
Signed-off-by: Aleksander Jan Bajkowski <olek2@wp.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/lantiq_etop.c

@@ -271,7 +271,8 @@ ltq_etop_hw_init(struct net_device *dev)
 		int irq = LTQ_DMA_CH0_INT + i;
 		struct ltq_etop_chan *ch = &priv->ch[i];
 
-		ch->idx = ch->dma.nr = i;
+		ch->dma.nr = i;
+		ch->idx = ch->dma.nr;
 		ch->dma.dev = &priv->pdev->dev;
 
 		if (IS_TX(i)) {