Update qaMuon.cxx

Author: ppoava

Common/Tasks/qaMuon.cxx

@@ -2570,7 +2570,6 @@ struct muonQa {
       double yPair = GetMuMuRap(fgValuesMuonPV1, fgValuesMuonPV2);
       double dcaXPair = muonPosPV.dcaX - muonNegPV.dcaX;
       double dcaYPair = muonPosPV.dcaY - muonNegPV.dcaY;
-      double pDca = muonPos.pDca;
       // mass cuts only used for DCA of Jpsi candidates
       double minJpsiMass = 2.8;
       double maxJpsiMass = 3.4;