[Cleanup] Fixed point iteration counter logic

src/sand-wedge.cc

@@ -131,7 +131,8 @@ class FixedPointIterator {
 
     Vector previousVelocityIterate = velocityIterate;
 
-    for (size_t fixedPointIteration = 1;
+    size_t fixedPointIteration;
+    for (fixedPointIteration = 1;
          fixedPointIteration <= fixedPointMaxIterations_;
          ++fixedPointIteration) {
       Vector v_m;
@@ -157,11 +158,11 @@ class FixedPointIterator {
           fixedPointTolerance_)
         break;
 
-      if (fixedPointIteration == fixedPointMaxIterations_)
-        DUNE_THROW(Dune::Exception, "FPI failed to converge");
-
       previousVelocityIterate = velocityIterate;
     }
+    if (fixedPointIteration == fixedPointMaxIterations_)
+      DUNE_THROW(Dune::Exception, "FPI failed to converge");
+
     velocityUpdater->postProcess(velocityIterate);
     velocityUpdater->postProcessRelativeQuantities();
   }