coverity#706052 Unintended sign extension
coverity#706052 Unintended sign extension

Change-Id: I5e9b8a8809f9736038f20493d1a24bbbd8846dbd

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