staging: comedi: quatech_daqp_cs: simplify IRQ_NONE checks in daqp_interrupt()

Remove all the pr_warn() noise in the sanity checks that make sure
the interrupt is for this device.

Simplify the sanity checks into one if() condition.

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>