staging: comedi: me4000: remove PDEBUG macro

The PDEBUG macro is used to output a bunch of debug messages in the
driver. These messages might be useful when first creating the driver
but they shouldn't be in mainline. Remove it.

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