coverity#736091 Improper use of negative value
coverity#736091 Improper use of negative value

Change-Id: I9cf59f66e4d8c7b1036f6808b428f3845aa181a9

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