* transform.c (lens_put): factor out bookkeeping around calling lns_put
* transform.c (lens_put): factor out bookkeeping around calling lns_put

Both transform_save and text_retrieve need to update the span info for
their root nodes. The lens_put function does that.

ptoscano/augeas,kunkku/augeas,mlichvar/augeas,ptoscano/augeas,mlichvar/augeas,mlichvar/augeas,ptoscano/augeas,lutter/augeas,pevalme/augeas,hercules-team/augeas,kunkku/augeas,kunkku/augeas,lutter/augeas,hercules-team/augeas,pevalme/augeas,pevalme/augeas,lutter/augeas