Fix preaccumulation error.

Author: oleburghardt

SU2_CFD/include/solvers/CFVMFlowSolverBase.inl

@@ -671,12 +671,12 @@ void CFVMFlowSolverBase<V, R>::ComputeVorticityAndStrainMag(const CConfig& confi
 
     StrainMag(iPoint) = sqrt(2.0*StrainMag(iPoint));
     AD::SetPreaccOut(StrainMag(iPoint));
+    AD::EndPreacc();
 
     /*--- Max is not differentiable, so we not register them for preacc. ---*/
     strainMax = max(strainMax, StrainMag(iPoint));
     omegaMax = max(omegaMax, GeometryToolbox::Norm(3, Vorticity));
 
-    AD::EndPreacc();
   }
   END_SU2_OMP_FOR