staging: rtl8192e: Convert array rx_ring_dma[] to variable rx_ring_dma

Convert array rx_ring_dma[] to variable rx_ring_dma as index is always 0.
This increases readability.

Signed-off-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/51d3be0a715452cefe5ac6dd29a86fbe65b824fa.1698295861.git.philipp.g.hortmann@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Philipp Hortmann

drivers/staging/rtl8192e/rtl8192e/r8192E_dev.c

@@ -1841,7 +1841,7 @@ void rtl92e_enable_rx(struct net_device *dev)
 {
 	struct r8192_priv *priv = (struct r8192_priv *)rtllib_priv(dev);
 
-	rtl92e_writel(dev, RDQDA, priv->rx_ring_dma[RX_MPDU_QUEUE]);
+	rtl92e_writel(dev, RDQDA, priv->rx_ring_dma);
 }
 
 static const u32 TX_DESC_BASE[] = {

drivers/staging/rtl8192e/rtl8192e/rtl_core.c

@@ -1159,7 +1159,7 @@ static void _rtl92e_free_rx_ring(struct net_device *dev)
 	dma_free_coherent(&priv->pdev->dev,
 			  sizeof(*priv->rx_ring) * priv->rxringcount,
 			  priv->rx_ring,
-			  priv->rx_ring_dma[rx_queue_idx]);
+			  priv->rx_ring_dma);
 	priv->rx_ring = NULL;
 }
 
@@ -1356,7 +1356,7 @@ static short _rtl92e_alloc_rx_ring(struct net_device *dev)
 
 	priv->rx_ring = dma_alloc_coherent(&priv->pdev->dev,
 					   sizeof(*priv->rx_ring) * priv->rxringcount,
-					   &priv->rx_ring_dma[rx_queue_idx],
+					   &priv->rx_ring_dma,
 					   GFP_ATOMIC);
 	if (!priv->rx_ring || (unsigned long)priv->rx_ring & 0xFF) {
 		netdev_warn(dev, "Cannot allocate RX ring\n");

drivers/staging/rtl8192e/rtl8192e/rtl_core.h

@@ -234,7 +234,7 @@ struct r8192_priv {
 
 	struct rx_desc *rx_ring;
 	struct sk_buff	*rx_buf[MAX_RX_COUNT];
-	dma_addr_t	rx_ring_dma[MAX_RX_QUEUE];
+	dma_addr_t	rx_ring_dma;
 	unsigned int	rx_idx[MAX_RX_QUEUE];
 	int		rxringcount;
 	u16		rxbuffersize;