#i120021# fix memory leak in PptSlidePersistEntry::~PptSlidePersistEntry()

Patch by: Chao Huang
Found by: Chao Huang
Review and minor modifications by: Herbert Duerr

filter/source/msfilter/svdfppt.cxx

@@ -588,6 +588,7 @@ PptSlidePersistEntry::PptSlidePersistEntry() :
 PptSlidePersistEntry::~PptSlidePersistEntry()
 {
     delete pStyleSheet;
+    delete pHeaderFooterEntry;
     delete pSolverContainer;
     delete[] pPresentationObjects;
 };