coverity#708356 Uninitialized pointer field

Change-Id: I9fe9932831bed1538d03f618074d457ea645230f

svx/source/form/filtnav.cxx

@@ -108,10 +108,10 @@ namespace svxform
 
 
 OFilterItemExchange::OFilterItemExchange()
+    : m_pFormItem(NULL)
 {
 }
 
-
 void OFilterItemExchange::AddSupportedFormats()
 {
     AddFormat(getFormatId());