Fix small typo in the ethernet driver

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13230 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/rdc/files/drivers/net/r6040.c

@@ -369,7 +369,7 @@ void r6040_free_txbufs(struct net_device *dev)
 				le32_to_cpu(lp->tx_insert_ptr->buf),
 				MAX_BUF_SIZE, PCI_DMA_TODEVICE);
 			dev_kfree_skb(lp->tx_insert_ptr->skb_ptr);
-			lp->rx_insert_ptr->skb_ptr = NULL;
+			lp->tx_insert_ptr->skb_ptr = NULL;
 		}
 		lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp;
 	}