USB: serial: oti6858: remove redundant assignment to variable divisor

The variable divisor is being assigned a value that is not being
read afterward, it is being re-assigned later in both paths of an if
statement.  The assignment is redundant and can be removed.

Cleans up clang scan warning:
drivers/usb/serial/oti6858.c:412:2: warning: Value stored to 'divisor'
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/oti6858.c

@@ -409,7 +409,6 @@ static void oti6858_set_termios(struct tty_struct *tty,
 	cflag = tty->termios.c_cflag;
 
 	spin_lock_irqsave(&priv->lock, flags);
-	divisor = priv->pending_setup.divisor;
 	frame_fmt = priv->pending_setup.frame_fmt;
 	control = priv->pending_setup.control;
 	spin_unlock_irqrestore(&priv->lock, flags);