i40evf: remove unnecessary error checking against i40e_shutdown_adminq

The i40e_shutdown_adminq function never returns failure. There is no need to
check the non-0 return value. Clean up the unnecessary error checking and
warning against it.

Change-ID: Ibb616f09cfb93bd1a872ebf3241a15fb8354b31b
Signed-off-by: Lihong Yang <lihong.yang@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40evf/i40evf_main.c

@@ -1785,8 +1785,7 @@ continue_reset:
 	i40evf_free_all_tx_resources(adapter);
 
 	/* kill and reinit the admin queue */
-	if (i40evf_shutdown_adminq(hw))
-		dev_warn(&adapter->pdev->dev, "Failed to shut down adminq\n");
+	i40evf_shutdown_adminq(hw);
 	adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
 	err = i40evf_init_adminq(hw);
 	if (err)