USB: mark expected switch fall-throughs

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

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

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/usb/misc/appledisplay.c        | 1 +
 drivers/usb/renesas_usbhs/mod_gadget.c | 1 +
 2 files changed, 2 insertions(+)

diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c
index b3eb8b9..d746c26 100644
--- a/drivers/usb/misc/appledisplay.c
+++ b/drivers/usb/misc/appledisplay.c
@@ -89,6 +89,7 @@ static void appledisplay_complete(struct urb *urb)
 		dev_err(dev,
 			"OVERFLOW with data length %d, actual length is %d\n",
 			ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
+		/* fall through */
 	case -ECONNRESET:
 	case -ENOENT:
 	case -ESHUTDOWN:
diff --git a/drivers/usb/renesas_usbhs/mod_gadget.c b/drivers/usb/renesas_usbhs/mod_gadget.c
index 33d059c..59cac40 100644
--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -502,6 +502,7 @@ static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
 	case READ_STATUS_STAGE:
 	case WRITE_STATUS_STAGE:
 		usbhs_dcp_control_transfer_done(pipe);
+		/* fall through */
 	default:
 		return ret;
 	}