Sample values in comedi are generally represented as unsigned values.
Change the element type of the `ao_data[]` member of `struct
icp_multi_private` from `short` to `unsigned short` for consistency.

Also remove the `ai_data` and `di_data` members as they are not used.

Signed-off-by: Ian Abbott <abbo...@mev.co.uk>
---
 drivers/staging/comedi/drivers/icp_multi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/staging/comedi/drivers/icp_multi.c 
b/drivers/staging/comedi/drivers/icp_multi.c
index 15d8718..1e16641 100644
--- a/drivers/staging/comedi/drivers/icp_multi.c
+++ b/drivers/staging/comedi/drivers/icp_multi.c
@@ -118,9 +118,7 @@ struct icp_multi_private {
        unsigned char act_chanlist_len; /*  len of scanlist */
        unsigned char act_chanlist_pos; /*  actual position in MUX list */
        unsigned int *ai_chanlist;      /*  actaul chanlist */
-       short *ai_data;         /*  data buffer */
-       short ao_data[4];       /*  data output buffer */
-       short di_data;          /*  Digital input data */
+       unsigned short ao_data[4];      /*  data output buffer */
        unsigned int do_data;   /*  Remember digital output data */
 };
 
-- 
1.8.4

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