removed unused variable warnings.

[[Imported from SVN: r6095]]

dune/common/test/configparsertest.cc

@@ -24,6 +24,8 @@ int main ()
 
     double testDouble      = parameterSet.get<double>("testDouble");
     int testInt            = parameterSet.get<int>("testInt");
+    ++testDouble;
+    ++testInt;
     std::string testString = parameterSet.get<std::string>("testString");
     typedef Dune::FieldVector<unsigned, 5> FVector;
     FVector testFVector    = parameterSet.get<FVector>("testVector");

dune/common/test/nullptr-test.cc

@@ -13,6 +13,7 @@ void basic_tests()
   char* ch2 = 0;         // ch2 has the null pointer value
 #ifdef FAIL
   int n = nullptr;       // error
+  ++n;
 #endif
   int n2 = 0;            // n2 is zero
   if( ch == 0 ) ;        // evaluates to true