coverity#707906 Uninitialized scalar field

Change-Id: Id950d4b575f49c45f5564b3a2d0e1be36ec3d572

hwpfilter/source/hwpread.cxx

@@ -542,14 +542,17 @@ bool Hidden::Read(HWPFile & hwpf)
     return !hwpf.State();
 }
 
-
 // header/footer(16)
-HeaderFooter::HeaderFooter():HBox(CH_HEADER_FOOTER)
+HeaderFooter::HeaderFooter()
+    : HBox(CH_HEADER_FOOTER)
+    , dummy(0)
+    , type(0)
+    , where(0)
+    , linenumber(0)
+    , m_nPageNumber(0)
 {
-    linenumber = 0;
 }
 
-
 bool HeaderFooter::Read(HWPFile & hwpf)
 {
     hwpf.Read2b(reserved, 2);