fixed problem with set angle dialog

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_2_BRANCH@7584 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/rotate/rotate.cpp

@@ -136,6 +136,7 @@ void MyFrame::OnAngle (wxCommandEvent &)
                                   degrees,
                                   -180, +180,
                                   this);
+    if ( degrees != -1 )
         m_angle = (degrees * M_PI) / 180.0;
 }