simplify SwClientIter dtor
simplify SwClientIter dtor

Change-Id: Ibf41f0c53b0454029601dd1cac479bdd82f50f0c

JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core,JurassicWordExcel/core