Remove unnecessary assertions.

[[Imported from SVN: r3242]]

istl/paamg/galerkin.hh

@@ -401,9 +401,6 @@ namespace Dune
       for(Vertex vertex = graph.begin(); vertex != vend; ++vertex)
         put(visitedMap, *vertex, false);
 
-      for(Vertex vertex = graph.begin(); vertex != vend; ++vertex)
-        assert(!get(visitedMap, *vertex));
-
       typedef typename I::const_iterator IndexIterator;
       const IndexIterator end = indices.end();
       for(IndexIterator index=indices.begin(); index != end; ++index) {