coverity#706004 Unintended sign extension
coverity#706004 Unintended sign extension

Change-Id: Ia8c12fbb9e546343eccf34b6f8e842983c287b2d

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