USB: serial: cp210x: clean up CSIZE handling

CSIZE is two-bit wide and only CS5 through CS8 are possible values.

Signed-off-by: Johan Hovold <johan@kernel.org>
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 54a4de0..66e0950 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -929,17 +929,10 @@ static void cp210x_set_termios(struct tty_struct *tty,
 			dev_dbg(dev, "%s - data bits = 7\n", __func__);
 			break;
 		case CS8:
+		default:
 			bits |= BITS_DATA_8;
 			dev_dbg(dev, "%s - data bits = 8\n", __func__);
 			break;
-		/*case CS9:
-			bits |= BITS_DATA_9;
-			dev_dbg(dev, "%s - data bits = 9\n", __func__);
-			break;*/
-		default:
-			dev_dbg(dev, "cp210x driver does not support the number of bits requested, using 8 bit mode\n");
-			bits |= BITS_DATA_8;
-			break;
 		}
 		if (cp210x_write_u16_reg(port, CP210X_SET_LINE_CTL, bits))
 			dev_dbg(dev, "Number of data bits requested not supported by device\n");