Fix up typo in filename ;-)

Change-Id: I604c5c31183024c17799aeaa26571e73633f231a
Reviewed-on: http://review.couchbase.org/40780
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>