PVS-Studio warning V519 for Geant4

G4double G4RKFieldIntegrator::CalculateTotalEnergy(
  const G4KineticTrackVector& Barions)
{
  G4double Etot = 0;
  ....
  for(G4int c2 = c1 + 1; c2 < nBarion; c2++)
  {
    ....
    //  Esk2
    Etot += t1*std::pow(Alpha/pi, 3/2)*std::exp(-Alpha*r12*r12);

    // Eyuk
    Etot += ....;

    // Ecoul
    Etot += 1.44*p1->GetDefinition()->GetPDGCharge()*
            p2->GetDefinition()->GetPDGCharge()/r12*
            Erf(std::sqrt(Alpha)*r12);

    // Epaul
    Etot = 0;
    ....
  }
  ....
}

This suspicious code was found in Geant4 project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'Etot' variable is assigned values twice successively. Perhaps this is a mistake. Check lines: 80, 83. _G4processes-archive g4rkfieldintegrator.cc 83

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