Bugfix: intermediate test results were not properly propagated

dune/solvers/test/cholmodsolvertest.cc

@@ -69,8 +69,8 @@ int main(int argc, char** argv)
 
     CHOLMODSolverTestSuite<1> testsuite1;
     CHOLMODSolverTestSuite<2> testsuite2;
-    passed = checkWithStandardGrids(testsuite1);
-    passed = checkWithStandardGrids(testsuite2);
+    passed &= checkWithStandardGrids(testsuite1);
+    passed &= checkWithStandardGrids(testsuite2);
 
     return passed ? 0 : 1;
 }