Remove unused variable

dune/solvers/test/multigridtest.cc

@@ -87,8 +87,6 @@ struct MultigridTestSuite
         typedef CompressedMultigridTransfer<Vector, BitVector, Matrix> TransferImplementation;
         typedef TruncatedBlockGSStep<Matrix, Vector> Smoother;
 
-        const int blockSize = Vector::block_type::dimension;
-
         // we need a vector of pointers to the transfer operator base class
         std::vector<Transfer*> transfer(grid.maxLevel());
         for (int i = 0; i < transfer.size(); ++i)