coverity: fix memory leak
coverity: fix memory leak

Change-Id: Idf97e7150617e53ce37ef5a98a7c4582ccc64271

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