bnx2/bnx2x: Unsupported Ethtool operations should return -EINVAL.

Some cards don't support changing vlan offloading settings.  Make
Ethtool set_flags return -EINVAL in those cases.

Reported-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/bnx2x/bnx2x_ethtool.c b/drivers/net/bnx2x/bnx2x_ethtool.c
index daefef6..d02ffbd 100644
--- a/drivers/net/bnx2x/bnx2x_ethtool.c
+++ b/drivers/net/bnx2x/bnx2x_ethtool.c
@@ -1123,7 +1123,7 @@
 	}
 
 	if (!(data & ETH_FLAG_RXVLAN))
-		return -EOPNOTSUPP;
+		return -EINVAL;
 
 	if ((data & ETH_FLAG_LRO) && bp->rx_csum && bp->disable_tpa)
 		return -EINVAL;