IPoIB: Get rid of ipoib_mcast_detach() wrapper

ipoib_mcast_detach() does nothing except call ib_detach_mcast(), so just
use the core API in the one place that does a multicast group detach.

add/remove: 0/1 grow/shrink: 0/1 up/down: 0/-105 (-105)
function                                     old     new   delta
ipoib_mcast_leave                            357     319     -38
ipoib_mcast_detach                            67       -     -67
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/ulp/ipoib/ipoib.h

@@ -486,8 +486,6 @@ void ipoib_path_iter_read(struct ipoib_path_iter *iter,
 
 int ipoib_mcast_attach(struct net_device *dev, u16 mlid,
 		       union ib_gid *mgid, int set_qkey);
-int ipoib_mcast_detach(struct net_device *dev, u16 mlid,
-		       union ib_gid *mgid);
 
 int ipoib_init_qp(struct net_device *dev);
 int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca);

drivers/infiniband/ulp/ipoib/ipoib_multicast.c

@@ -627,10 +627,10 @@ static int ipoib_mcast_leave(struct net_device *dev, struct ipoib_mcast *mcast)
 				IPOIB_GID_ARG(mcast->mcmember.mgid));
 
 		/* Remove ourselves from the multicast group */
-		ret = ipoib_mcast_detach(dev, be16_to_cpu(mcast->mcmember.mlid),
-					 &mcast->mcmember.mgid);
+		ret = ib_detach_mcast(priv->qp, &mcast->mcmember.mgid,
+				      be16_to_cpu(mcast->mcmember.mlid));
 		if (ret)
-			ipoib_warn(priv, "ipoib_mcast_detach failed (result = %d)\n", ret);
+			ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
 	}
 
 	return 0;

drivers/infiniband/ulp/ipoib/ipoib_verbs.c

@@ -72,18 +72,6 @@ int ipoib_mcast_attach(struct net_device *dev, u16 mlid, union ib_gid *mgid, int
 	return ret;
 }
 
-int ipoib_mcast_detach(struct net_device *dev, u16 mlid, union ib_gid *mgid)
-{
-	struct ipoib_dev_priv *priv = netdev_priv(dev);
-	int ret;
-
-	ret = ib_detach_mcast(priv->qp, mgid, mlid);
-	if (ret)
-		ipoib_warn(priv, "ib_detach_mcast failed (result = %d)\n", ret);
-
-	return ret;
-}
-
 int ipoib_init_qp(struct net_device *dev)
 {
 	struct ipoib_dev_priv *priv = netdev_priv(dev);