staging: comedi: dmm32at: remove dmm_inb macro

The macro is just a wrapper for inb(). Just use the inb() directly.

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>