USB: serial: ftdi_sio: remove redundant assignment to variable cflag

The variable cflag is being assigned a value that is not being read
afterwards, it is being re-assigned later on. The assignment is
redundant and can be removed.

Cleans up clang scan warning:
drivers/usb/serial/ftdi_sio.c:2613:15: warning: Value stored to 'cflag'
during its initialization is never read [deadcode.DeadStores]
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/ftdi_sio.c

@@ -2612,7 +2612,7 @@ static void ftdi_set_termios(struct tty_struct *tty,
 	struct device *ddev = &port->dev;
 	struct ftdi_private *priv = usb_get_serial_port_data(port);
 	struct ktermios *termios = &tty->termios;
-	unsigned int cflag = termios->c_cflag;
+	unsigned int cflag;
 	u16 value, index;
 	int ret;