staging: comedi: amplc_pci224: only calc the pacer divisors once

When the cmd->scan_begin_src == TRIG_TIMER the divisors needed to
generate the pacer time are calculated in the (*do_cmdtest) to
validate the cmd->scan_begin_arg. The core always does the
(*do_cmdtest) before the (*do_cmd) so there is no reason to recalc
the divisors.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/amplc_pci224.c

@@ -869,14 +869,6 @@ static void pci224_ao_start_pacer(struct comedi_device *dev,
 				  struct comedi_subdevice *s)
 {
 	struct pci224_private *devpriv = dev->private;
-	struct comedi_cmd *cmd = &s->async->cmd;
-
-	/* Use two timers. */
-	i8253_cascade_ns_to_timer(I8254_OSC_BASE_10MHZ,
-				  &devpriv->cached_div1,
-				  &devpriv->cached_div2,
-				  &cmd->scan_begin_arg,
-				  cmd->flags);
 
 	/*
 	 * The output of timer Z2-0 will be used as the scan trigger