Warning fix.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32592 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/mediaplayer/mediaplayer.cpp

@@ -875,6 +875,7 @@ MyNotebookPage::MyNotebookPage(wxNotebook* theBook) :
     //  Make sure creation was successful
     bool bOK = m_mediactrl->Create(this, wxID_MEDIACTRL);
     wxASSERT_MSG(bOK, wxT("Could not create media control!"));
+    wxUnusedVar(bOK);
 
     vertsizer->Add(m_mediactrl, 0, wxALIGN_CENTER_HORIZONTAL|wxALL, 5);