IPoIB: Remove unused IPOIB_MCAST_STARTED code

The IPOIB_MCAST_STARTED flag is not used at all since commit b3e2749b
("IPoIB: Don't drop multicast sends when they can be queued"), so
remove it.

Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/ipoib/ipoib_multicast.c

@@ -592,10 +592,6 @@ int ipoib_mcast_start_thread(struct net_device *dev)
 		queue_delayed_work(ipoib_workqueue, &priv->mcast_task, 0);
 	mutex_unlock(&mcast_mutex);
 
-	spin_lock_irq(&priv->lock);
-	set_bit(IPOIB_MCAST_STARTED, &priv->flags);
-	spin_unlock_irq(&priv->lock);
-
 	return 0;
 }
 
@@ -605,10 +601,6 @@ int ipoib_mcast_stop_thread(struct net_device *dev, int flush)
 
 	ipoib_dbg_mcast(priv, "stopping multicast thread\n");
 
-	spin_lock_irq(&priv->lock);
-	clear_bit(IPOIB_MCAST_STARTED, &priv->flags);
-	spin_unlock_irq(&priv->lock);
-
 	mutex_lock(&mcast_mutex);
 	clear_bit(IPOIB_MCAST_RUN, &priv->flags);
 	cancel_delayed_work(&priv->mcast_task);