removed a couple of trivial build warnings

pcbnew/dialog_drc.cpp

@@ -392,8 +392,6 @@ bool WinEDA_DrcFrame::ProcessEvent( wxEvent& event )
                 if( wxTE_HT_UNKNOWN != m_logWindow->HitTest( pos, &col, &row ) )
                 {
                     wxString text = m_logWindow->GetLineText( row );
-                    
-                    int debug = 1;
                 }
             }
         }

pcbnew/zones.cpp

@@ -249,7 +249,7 @@ void WinEDA_ZoneFrame::CreateControls()
     static const int GridList[4] = { 50, 100, 250, 500 };
     int selection = 0;
 
-    for( unsigned ii = 0; ii < m_GridCtrl->GetCount(); ii++ )
+    for( int ii = 0; ii < m_GridCtrl->GetCount(); ii++ )
     {
         wxString msg = ReturnStringFromValue( g_UnitMetric,
                                               GridList[ii],