USB: serial: ftdi_sio: use cur_altsetting for consistency

ftdi_determine_type() function had this construct in it to get the
number of the interface it is operating on:

  inter = serial->interface->altsetting->desc.bInterfaceNumber;

Elsewhere in this driver cur_altsetting is used instead for this
purpose.  Change ftdi_determine_type() to use cur_altsetting
for consistency.
Signed-off-by: Mychaela N. Falconia <falcon@freecalypso.org>
[ johan: fix old style issues; drop braces and random white space ]
Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/ftdi_sio.c

@@ -1571,7 +1571,8 @@ static void ftdi_determine_type(struct usb_serial_port *port)
 	dev_dbg(&port->dev, "%s: bcdDevice = 0x%x, bNumInterfaces = %u\n", __func__,
 		version, interfaces);
 	if (interfaces > 1) {
-		int inter;
+		struct usb_interface *intf = serial->interface;
+		int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
 
 		/* Multiple interfaces.*/
 		if (version == 0x0800) {
@@ -1586,16 +1587,15 @@ static void ftdi_determine_type(struct usb_serial_port *port)
 			priv->chip_type = FT2232C;
 
 		/* Determine interface code. */
-		inter = serial->interface->altsetting->desc.bInterfaceNumber;
-		if (inter == 0) {
+		if (ifnum == 0)
 			priv->interface = INTERFACE_A;
-		} else  if (inter == 1) {
+		else if (ifnum == 1)
 			priv->interface = INTERFACE_B;
-		} else  if (inter == 2) {
+		else if (ifnum == 2)
 			priv->interface = INTERFACE_C;
-		} else  if (inter == 3) {
+		else if (ifnum == 3)
 			priv->interface = INTERFACE_D;
-		}
+
 		/* BM-type devices have a bug where bcdDevice gets set
 		 * to 0x200 when iSerialNumber is 0.  */
 		if (version < 0x500) {