Fixed missing reference to LCB_SUCCESS in error enum.

Change-Id: I1f2f49f022bc6c0ecf33fb0254e92a353db6c015
Reviewed-on: http://review.couchbase.org/28939
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Brett Lawson <brett19@gmail.com>