coverity#706101 Unintended sign extension
coverity#706101 Unintended sign extension

Change-Id: Ic044245aef233501c03e342084f5c27a1bee8d4e

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