staging: comedi: gsc_hpdi: validate the cmd->start_arg
The cmd->start_arg should be trivially validated in Step 3 of the (*do_cmdtest) functions. Add the necessary 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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