coverity#706065 Unintended sign extension
coverity#706065 Unintended sign extension

Change-Id: If482c75af5128778a176c40e38000b78f2087131

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