staging: comedi: cb_pcidas64: change params to external_ai_queue_in_use()

The caller already has the comedi_subdevice and comedi_cmd pointers. Pass
those variables to the helper function.

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>