MB-11537: Items remaining for a dead stream should be 0

Change-Id: I18512199680af051130b08b780ab0af44b860593
Reviewed-on: http://review.couchbase.org/38850
Reviewed-by: Sriram Ganesan <sriram@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>