coverity: finally fix the memory leak correctly
coverity: finally fix the memory leak correctly

Change-Id: I1cd8978eba9f42aaa3d5e53085cac23f5e6a31ef

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