Avoid undef use of null ptr, use offsetof instead
Avoid undef use of null ptr, use offsetof instead

Change-Id: I47b1d8e7b119e50406b50f580ee06f9f1b5f8401

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