Use an uint for scode as opposed to unsigned short to avoid truncation

Since scode is effectively an uint and not an unsigned short like wcode
is then we should go with the bigger type to ensure it is not truncated.

Change-Id: I6f1affea5a06371eb3c3a632c3ecb9578f6254e4
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>