staging: comedi: dt3000: use cfc_handle_events()

Use the comedi_fc helper function to automatically call the subdevice
(*cancel) function when needed and call comedi_event().

Update the Kconfig so that COMEDI_DT3000 selects COMEDI_FC.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/Kconfig

@@ -860,6 +860,7 @@ config COMEDI_DAS08_PCI
 
 config COMEDI_DT3000
 	tristate "Data Translation DT3000 series support"
+	select COMEDI_FC
 	---help---
 	  Enable support for Data Translation DT3000 series
 	  DT3001, DT3001-PGL, DT3002, DT3003, DT3003-PGL, DT3004, DT3005 and

drivers/staging/comedi/drivers/dt3000.c

@@ -369,12 +369,10 @@ static irqreturn_t dt3k_interrupt(int irq, void *d)
 		s->async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
 
 	debug_n_ints++;
-	if (debug_n_ints >= 10) {
-		dt3k_ai_cancel(dev, s);
+	if (debug_n_ints >= 10)
 		s->async->events |= COMEDI_CB_EOA;
-	}
 
-	comedi_event(dev, s);
+	cfc_handle_events(dev, s);
 	return IRQ_HANDLED;
 }