simplify SwClient::operator++()
simplify SwClient::operator++()

Change-Id: I17bdfb4cec60a4f9b18b7df3ba4c131771ba0f08

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