staging: comedi: amplc_pci224: factor out chanlist checking from (*do_cmdtest)
Step 5 of the (*do_cmdtest) validates that the cmd->chanlist is compatible with the hardware. For aesthetics, factor the step 5 code for the analog output async command support. Tidy up the factored out code. 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>
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