usb: host: oxu210hp-hcd: mark expected switch fall-through

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

Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/oxu210hp-hcd.c

@@ -3040,7 +3040,7 @@ idle_timeout:
 			qh_put(qh);
 			break;
 		}
-		/* else FALL THROUGH */
+		/* fall through */
 	default:
 nogood:
 		/* caller was supposed to have unlinked any requests;