staging: comedi: fix scan_end_arg == chanlist_len assumption
Some comedi drivers allow the `scan_end_arg` value of an asynchronous command to be a multiple (> 1) of the `chanlist_len` although most require them to be the same value. `comedi_bytes_per_scan()` is incorrectly using `chanlist_len` as the length of the scan. Change it to use `scan_end_arg`. `comedi_nsamples_left()` is incorrectly using `cur_chan` as the current sample position in the scan (it is actually the current position in the channel list). Change it to use the actual sample position in the scan. (Unfortunately we only have the current scan position in bytes currently, so convert that to a sample position.) Signed-off-by: Ian Abbott <abbotti@mev.co.uk> Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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