staging: comedi: addi_common.h: remove 'ui_AiScanLength' from private data
This member of the private data is a copy of the cmd->scan_end_arg. Use that instead. Use a local variable in apci3120_cyclic_ai() for the DMA 'scan_bytes', which is the cmd->scan_end_arg * 2. Replace the open-coded '2' with sizeof(short). Signed-off-by: NH Hartley Sweeten <hsweeten@visionengravers.com> Reviewed-by: NIan Abbott <abbotti@mev.co.uk> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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