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Use the comedi_subdevice 'readback' member and the core provided (*insn_read) to handle the readback of the write-only analog output subdevice. Remove the then unused 'ao_data' member from the private data. The private data is now unnecessary. Remove it and the allocation. For aesthetics, rename the (*insn_write) function and tidy it up a bit. 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>