ixgbe: fix the return value for unsupported VF offload

When failing the request because we can't support that offload,
reporting EOPNOTSUPP makes much more sense than ENXIO.
Signed-off-by: NShannon Nelson <shannon.nelson@oracle.com>
Tested-by: NAndrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/ixgbe/ixgbe_ipsec.c

@@ -894,7 +894,7 @@ int ixgbe_ipsec_vf_add_sa(struct ixgbe_adapter *adapter, u32 *msgbuf, u32 vf)
 	 * device, so block these requests for now.
 	 */
 	if (!(sam->flags & XFRM_OFFLOAD_INBOUND)) {
-		err = -ENXIO;
+		err = -EOPNOTSUPP;
 		goto err_out;
 	}