coverity#736883 Unintended sign extension
coverity#736883 Unintended sign extension

Change-Id: I8e6a81b6c1605bd1be33f5f8d75d2472a39361d4

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