net/amd: Remove needless assignment and the extra brank lines

The variable 'err = -ENODEV;' in au1000_probe() is
duplicate, so remove redundant one. And remove the
extra blank lines in the file au1000_eth.c
Signed-off-by: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Signed-off-by: Tang Bin <tangbin@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/amd/au1000_eth.c

@@ -241,7 +241,6 @@ MODULE_LICENSE("GPL");
  * ps: make sure the used irqs are configured properly in the board
  * specific irq-map
  */
-
 static void au1000_enable_mac(struct net_device *dev, int force_reset)
 {
 	unsigned long flags;
@@ -556,7 +555,6 @@ static int au1000_mii_probe(struct net_device *dev)
 	return 0;
 }
 
-
 /*
  * Buffer allocation/deallocation routines. The buffer descriptor returned
  * has the virtual and dma address of a buffer suitable for
@@ -647,7 +645,6 @@ au1000_setup_hw_rings(struct au1000_private *aup, void __iomem *tx_base)
 /*
  * ethtool operations
  */
-
 static void
 au1000_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 {
@@ -679,7 +676,6 @@ static const struct ethtool_ops au1000_ethtool_ops = {
 	.set_link_ksettings = phy_ethtool_set_link_ksettings,
 };
 
-
 /*
  * Initialize the interface.
  *
@@ -1255,7 +1251,6 @@ static int au1000_probe(struct platform_device *pdev)
 		aup->rx_db_inuse[i] = pDB;
 	}
 
-	err = -ENODEV;
 	for (i = 0; i < NUM_TX_DMA; i++) {
 		pDB = au1000_GetFreeDB(aup);
 		if (!pDB)