i40e: update error message when trying to add invalid filters

Re-word the error message displayed when adding a filter with an
invalid flow type. Additionally, report a distinct error message when
the IPv4 protocol is at fault.

Change-ID: Iba3d85b87f8d383c97c8bdd180df34a6adf3ee67
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_txrx.c

@@ -533,14 +533,15 @@ int i40e_add_del_fdir(struct i40e_vsi *vsi,
 			break;
 		default:
 			/* We cannot support masking based on protocol */
-			goto unsupported_flow;
+			dev_info(&pf->pdev->dev, "Unsupported IPv4 protocol 0x%02x\n",
+				 input->ip4_proto);
+			return -EINVAL;
 		}
 		break;
 	default:
-unsupported_flow:
-		dev_info(&pf->pdev->dev, "Could not specify spec type %d\n",
+		dev_info(&pf->pdev->dev, "Unsupported flow type 0x%02x\n",
 			 input->flow_type);
-		ret = -EINVAL;
+		return -EINVAL;
 	}
 
 	/* The buffer allocated here will be normally be freed by