staging: comedi: dt282x: remove disable code that disables the irq

The code that would disable the irq after getting a number of D/A errors
is disabled. Just remove it.

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>