i40e: only register client on iWarp-capable devices

The client interface is only intended for use on devices that support
iWarp. Only register with the client if this is the case.

This fixes a panic when loading i40iw on X710 devices.
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Reported-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -11245,10 +11245,12 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 		  round_jiffies(jiffies + pf->service_timer_period));
 
 	/* add this PF to client device list and launch a client service task */
+	if (pf->flags & I40E_FLAG_IWARP_ENABLED) {
 		err = i40e_lan_add_device(pf);
 		if (err)
 			dev_info(&pdev->dev, "Failed to add PF to client API service list: %d\n",
 				 err);
+	}
 
 #define PCI_SPEED_SIZE 8
 #define PCI_WIDTH_SIZE 8
@@ -11426,8 +11428,9 @@ static void i40e_remove(struct pci_dev *pdev)
 		i40e_vsi_release(pf->vsi[pf->lan_vsi]);
 
 	/* remove attached clients */
+	if (pf->flags & I40E_FLAG_IWARP_ENABLED) {
 		ret_code = i40e_lan_del_device(pf);
-	if (ret_code) {
+		if (ret_code)
 			dev_warn(&pdev->dev, "Failed to delete client device: %d\n",
 				 ret_code);
 	}