router: fix compilation warnings

pcbnew/router/pns_meander.cpp

@@ -196,7 +196,6 @@ SHAPE_LINE_CHAIN PNS_MEANDER_SHAPE::makeMiterShape( VECTOR2D aP, VECTOR2D aDir,
     lc.Append( ( int ) p.x, ( int ) p.y );
 
 
-    PNS_DEBUG_DECORATOR *dbg = PNS_ROUTER::GetInstance()->GetInterface()->GetDebugDecorator();
     // fixme: refactor
     switch (m_placer->MeanderSettings().m_cornerStyle)
     {

pcbnew/router/pns_node.cpp

@@ -261,6 +261,8 @@ int PNS_NODE::QueryColliding( const PNS_ITEM *aItem,
         aVisitor.SetWorld( m_root, this );
         m_root->m_index->Query( aItem, m_maxClearance, aVisitor );
     }
+
+    return 0;
 }