orinoco: Use fallthrough pseudo-keyword

Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1].

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-throughSigned-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200821063402.GA12500@embeddedor

drivers/net/wireless/intersil/orinoco/main.c

@@ -1503,7 +1503,7 @@ void __orinoco_ev_info(struct net_device *dev, struct hermes *hw)
 			schedule_work(&priv->join_work);
 			break;
 		}
-		/* fall through */
+		fallthrough;
 	case HERMES_INQ_HOSTSCAN:
 	case HERMES_INQ_HOSTSCAN_SYMBOL: {
 		/* Result of a scanning. Contains information about
@@ -1594,7 +1594,7 @@ void __orinoco_ev_info(struct net_device *dev, struct hermes *hw)
 		/* Ignore this frame for now */
 		if (priv->firmware_type == FIRMWARE_TYPE_AGERE)
 			break;
-		/* fall through */
+		fallthrough;
 	default:
 		printk(KERN_DEBUG "%s: Unknown information frame received: "
 		       "type 0x%04x, length %d\n", dev->name, type, len);

drivers/net/wireless/intersil/orinoco/orinoco_usb.c

@@ -535,7 +535,7 @@ static void ezusb_request_out_callback(struct urb *urb)
 						       flags);
 				break;
 			}
-			/* fall through */
+			fallthrough;
 		case EZUSB_CTX_RESP_RECEIVED:
 			/* IN already received before this OUT-ACK */
 			ctx->state = EZUSB_CTX_COMPLETE;
@@ -557,7 +557,7 @@ static void ezusb_request_out_callback(struct urb *urb)
 		case EZUSB_CTX_REQ_SUBMITTED:
 		case EZUSB_CTX_RESP_RECEIVED:
 			ctx->state = EZUSB_CTX_REQ_FAILED;
-			/* fall through */
+			fallthrough;
 
 		case EZUSB_CTX_REQ_FAILED:
 		case EZUSB_CTX_REQ_TIMEOUT:
@@ -897,11 +897,11 @@ static int ezusb_access_ltv(struct ezusb_priv *upriv,
 	case EZUSB_CTX_REQ_SUBMITTED:
 		if (!ctx->in_rid)
 			break;
-		/* fall through */
+		fallthrough;
 	default:
 		err("%s: Unexpected context state %d", __func__,
 		    state);
-		/* fall through */
+		fallthrough;
 	case EZUSB_CTX_REQ_TIMEOUT:
 	case EZUSB_CTX_REQ_FAILED:
 	case EZUSB_CTX_RESP_TIMEOUT: