coverity#707905 Uninitialized scalar field

Change-Id: Icb00858146d65963a1c3144a61aa467d7da461e4

hwpfilter/source/hwpread.cxx

@@ -637,13 +637,16 @@ bool NewNum::Read(HWPFile & hwpf)
     return !hwpf.State();
 }
 
-
 // show page number (20)
-ShowPageNum::ShowPageNum():HBox(CH_SHOW_PAGE_NUM)
+ShowPageNum::ShowPageNum()
+    : HBox(CH_SHOW_PAGE_NUM)
+    , where(0)
+    , m_nPageNumber(0)
+    , shape(0)
+    , dummy(0)
 {
 }
 
-
 bool ShowPageNum::Read(HWPFile & hwpf)
 {
     hwpf.Read2b(&where, 1);