drivers/net: return operator cleanup

Change "return (EXPR);" to "return EXPR;"

return is not a function, parentheses are not required.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/igbvf/ethtool.c b/drivers/net/igbvf/ethtool.c
index 103b3aa..33add70 100644
--- a/drivers/net/igbvf/ethtool.c
+++ b/drivers/net/igbvf/ethtool.c
@@ -153,7 +153,7 @@
 
 static u32 igbvf_get_tx_csum(struct net_device *netdev)
 {
-	return ((netdev->features & NETIF_F_IP_CSUM) != 0);
+	return (netdev->features & NETIF_F_IP_CSUM) != 0;
 }
 
 static int igbvf_set_tx_csum(struct net_device *netdev, u32 data)