initialize normOfOldCorrection to 1 instead of 0. This avoids one occurrence of NaN

[[Imported from SVN: r2951]]

dune-solvers/solvers/loopsolver.cc

@@ -63,7 +63,7 @@ void ::LoopSolver<VectorType, BitVectorType>::solve()
 
     double error = std::numeric_limits<double>::max();
 
-    double normOfOldCorrection = 0;
+    double normOfOldCorrection = 1;
     double normOfOldError = 0;
     double totalConvRate = 1;
     this->maxTotalConvRate_ = 0;