message: Fix check for negative square root argument
diff: @@ -143,7 +143,7 @@ GPUd() inline float AliHLTTPCGMTrackParam::GetMirroredY( float Bz ) const
  float qptBz = GetQPt()*Bz;
  float cosPhi2 = 1.f - GetSinPhi()*GetSinPhi();
  if( fabs(qptBz)<1.e-8 ) qptBz = 1.e-8;
  - if( fabs(cosPhi2)<0.f ) cosPhi2 = 0.f;
  + if( cosPhi2<0.f ) cosPhi2 = 0.f;
  return GetY() - 2.f*sqrt(cosPhi2)/qptBz;
  }
  