[Bluetooth] Fix unintentional fall-through in HCI line discipline

A trivial fix to (what looks like) an unintentional fall-through in the
HCI line discipline.

Signed-off-by: Ohad Ben-Cohen <ohad@bencohen.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index e8ae0d7..6055b9c 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -475,6 +475,7 @@
 			tty->low_latency = 1;
 		} else
 			return -EBUSY;
+		break;
 
 	case HCIUARTGETPROTO:
 		if (test_bit(HCI_UART_PROTO_SET, &hu->flags))