drivers/net/r6040.c: fix sparse warning: Using plain integer as NULL pointer

Fix this sparse warnings:
  drivers/net/r6040.c:487:31: warning: Using plain integer as NULL pointer
  drivers/net/r6040.c:492:31: warning: Using plain integer as NULL pointer

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Acked-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/r6040.c b/drivers/net/r6040.c
index 3c27a7bfea49..9c95ebe643a3 100644
--- a/drivers/net/r6040.c
+++ b/drivers/net/r6040.c
@@ -484,12 +484,12 @@ static int r6040_close(struct net_device *dev)
         /* Free Descriptor memory */
         if (lp->rx_ring) {
                 pci_free_consistent(pdev, RX_DESC_SIZE, lp->rx_ring, lp->rx_ring_dma);
-                lp->rx_ring = 0;
+                lp->rx_ring = NULL;
         }
 
         if (lp->tx_ring) {
                 pci_free_consistent(pdev, TX_DESC_SIZE, lp->tx_ring, lp->tx_ring_dma);
-                lp->tx_ring = 0;
+                lp->tx_ring = NULL;
         }
 
         return 0;