USB: serial: iuu_phoenix: remove redundant assignment of DIV to itself

The assignment of DIV to itself is redundant and can be removed.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NJohan Hovold <johan@kernel.org>

drivers/usb/serial/iuu_phoenix.c

@@ -472,7 +472,6 @@ static int iuu_clk(struct usb_serial_port *port, int dwFrq)
 				}
 	}
 	P2 = ((P - PO) / 2) - 4;
-	DIV = DIV;
 	PUMP = 0x04;
 	PBmsb = (P2 >> 8 & 0x03);
 	PBlsb = P2 & 0xFF;