staging: comedi: ni_pcidio: tidy up the irq request

The irq is only needed to support async commands. Tidy up the
code that does the request_irq() and remove the noise.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Cc: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/comedi/drivers/ni_pcidio.c
Simple merge