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>
diff --git a/drivers/staging/comedi/Kconfig b/drivers/staging/comedi/Kconfig
index 2fb0cc0..279364a 100644
--- a/drivers/staging/comedi/Kconfig
+++ b/drivers/staging/comedi/Kconfig
@@ -860,6 +860,7 @@
 
 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