RDMA: Fix return value check for ib_get_eth_speed()

ib_get_eth_speed() return 0 on success. Fixing the condition checking
and prevent reporting failure for query_port verb.

Fixes: d4186194 ("Add generic function to extract IB speed from netdev")
Signed-off-by: Selvin Xavier <selvin.xavier@broadcom.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

drivers/infiniband/hw/bnxt_re/ib_verbs.c

@@ -264,7 +264,7 @@ int bnxt_re_query_port(struct ib_device *ibdev, u8 port_num,
 	 * IB stack to avoid race in the NETDEV_UNREG path
 	 */
 	if (test_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags))
-		if (!ib_get_eth_speed(ibdev, port_num, &port_attr->active_speed,
+		if (ib_get_eth_speed(ibdev, port_num, &port_attr->active_speed,
 				     &port_attr->active_width))
 			return -EINVAL;
 	return 0;

drivers/infiniband/hw/usnic/usnic_ib_verbs.c

@@ -309,7 +309,7 @@ int usnic_ib_query_port(struct ib_device *ibdev, u8 port,
 	usnic_dbg("\n");
 
 	mutex_lock(&us_ibdev->usdev_lock);
-	if (!ib_get_eth_speed(ibdev, port, &props->active_speed,
+	if (ib_get_eth_speed(ibdev, port, &props->active_speed,
 			     &props->active_width)) {
 		mutex_unlock(&us_ibdev->usdev_lock);
 		return -EINVAL;