VC++ warning fixes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21885 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/cmdproc.cpp

@@ -159,7 +159,7 @@ bool wxCommandProcessor::Undo()
 bool wxCommandProcessor::Redo()
 {
     wxCommand *redoCommand = (wxCommand *) NULL;
-    wxList::compatibility_iterator redoNode;
+    wxList::compatibility_iterator redoNode = 0;
 
     if ( m_currentCommand )
     {

src/common/dcbase.cpp

@@ -290,7 +290,7 @@ void wxDCBase::DoDrawSpline( wxList *points )
 
     wx_spline_add_point(x1, y1);
 
-    while ((node = node->GetNext()))
+    while ((node = node->GetNext()) != NULL)
     {
         p = (wxPoint *)node->GetData();
         x1 = x2;

src/html/htmlpars.cpp

@@ -374,8 +374,8 @@ void wxHtmlParser::PopTagHandler()
 {
     wxList::compatibility_iterator first;
 
-    if (m_HandlersStack == NULL ||
-        !(first = m_HandlersStack->GetFirst()))
+    if ( !m_HandlersStack ||
+         (first = m_HandlersStack->GetFirst()) == NULL )
     {
         wxLogWarning(_("Warning: attempt to remove HTML tag handler from empty stack."));
         return;

src/msw/dialog.cpp

@@ -191,7 +191,7 @@ bool wxDialog::IsModal() const
 
 bool wxDialog::IsModalShowing() const
 {
-    return wxModalDialogs.Find((wxDialog *)this); // const_cast
+    return wxModalDialogs.Find(wxConstCast(this, wxDialog)) != NULL;
 }
 
 wxWindow *wxDialog::FindSuitableParent() const