staging: comedi: adl_pci9118: ai (*insn_read) does not use interrupts

The analog input (*insn_read) in this driver is done as a software-triggered,
polled operation. The PCI9118_AI_CTRL_INT bit in the control register, which
is actually set in setup_channel_list(), should not be set.

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>