net: usbnet: mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through.

Addresses-Coverity-ID: 1077614 ("Missing break in switch")

---
 drivers/net/usb/usbnet.c | 1 +
 1 file changed, 1 insertion(+)

index 770aa62..73aa333 100644
@@ -1527,6 +1527,7 @@ static void usbnet_bh (struct timer_list *t)
 			continue;
 		case tx_done:
 			kfree(entry->urb->sg);
+			/* fall through */
 		case rx_cleanup:
 			usb_free_urb (entry->urb);
 			dev_kfree_skb (skb);

From: "Gustavo A. R. Silva" <[email protected]>
Date: Mon, 3 Sep 2018 13:48:45 -0500

Applied, thank you.