t_sllist => t_slist

Change-Id: Ib0a54d264ff52f16a2f1ff3af27526f5e1f5afb7
Reviewed-on: http://review.couchbase.org/33950
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>