coverity#1202818 improper use of negative value
coverity#1202818 improper use of negative value

Change-Id: I2b5fed2f9f9d6a4aa6a8087843fa1805c2d1ffe4

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