ixgbe: dcbnl reduce duplicated code and indentation

Replace duplicated code in if/else branches with single
check and ixgbe_init_interrupt_scheme().
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ixgbe/ixgbe_dcb_nl.c

@@ -146,13 +146,11 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
 		adapter->flags |= IXGBE_FLAG_DCB_ENABLED;
 		if (!netdev_get_num_tc(netdev))
 			ixgbe_setup_tc(netdev, MAX_TRAFFIC_CLASS);
-
-		ixgbe_init_interrupt_scheme(adapter);
-		if (netif_running(netdev))
-			netdev->netdev_ops->ndo_open(netdev);
 	} else {
 		/* Turn off DCB */
-		if (adapter->flags & IXGBE_FLAG_DCB_ENABLED) {
+		if (!(adapter->flags & IXGBE_FLAG_DCB_ENABLED))
+			goto out;
+
 		if (netif_running(netdev))
 			netdev->netdev_ops->ndo_stop(netdev);
 		ixgbe_clear_interrupt_scheme(adapter);
@@ -171,12 +169,11 @@ static u8 ixgbe_dcbnl_set_state(struct net_device *netdev, u8 state)
 		}
 
 		ixgbe_setup_tc(netdev, 0);
+	}
 
 	ixgbe_init_interrupt_scheme(adapter);
 	if (netif_running(netdev))
 		netdev->netdev_ops->ndo_open(netdev);
-		}
-	}
 out:
 	return err;
 }