MB-9944: Pass the right number of args to Item in getNextItem()

Change-Id: Ie1472fa0ff3fa49d0180104b3ccb51212011aeda
Reviewed-on: http://review.couchbase.org/32608
Reviewed-by: Chiyoung Seo <chiyoung@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>