coverity#707915 Uninitialized scalar field

Change-Id: I9617b67f9a3af7fff43ae1ff5b98c1066c53059b

hwpfilter/source/hwpread.cxx

@@ -582,11 +582,15 @@ bool HeaderFooter::Read(HWPFile & hwpf)
 
 
 // footnote(17)
-Footnote::Footnote():HBox(CH_FOOTNOTE)
+Footnote::Footnote()
+    : HBox(CH_FOOTNOTE)
+    , dummy(0)
+    , number(0)
+    , type(0)
+    , width(0)
 {
 }
 
-
 bool Footnote::Read(HWPFile & hwpf)
 {
     hwpf.Read2b(reserved, 2);