RDMA/ipoib: Fix return code from ipoib_cm_dev_init

The proper return code is -EOPNOTSUPP and not -ENOSYS when the function
isn't supported, also make sure to return the right error code
from ipoib_transport_dev_init() when ipoib_cm_dev_init() is supported.
Signed-off-by: Kamal Heib <kamalheib1@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/ulp/ipoib/ipoib.h

@@ -729,7 +729,7 @@ void ipoib_cm_dev_stop(struct net_device *dev)
 static inline
 int ipoib_cm_dev_init(struct net_device *dev)
 {
-	return -ENOSYS;
+	return -EOPNOTSUPP;
 }
 
 static inline

drivers/infiniband/ulp/ipoib/ipoib_verbs.c

@@ -168,8 +168,8 @@ int ipoib_transport_dev_init(struct net_device *dev, struct ib_device *ca)
 		else
 			size += ipoib_recvq_size * ipoib_max_conn_qp;
 	} else
-		if (ret != -ENOSYS)
-			return -ENODEV;
+		if (ret != -EOPNOTSUPP)
+			return ret;
 
 	req_vec = (priv->port - 1) * 2;