Fix unused variables, parameters, values

Fixes errors from the following Clang-Tidy categories:

- `clang-analyzer-deadcode.DeadStores`
- `clang-diagnostic-unused-parameter`
- `clang-diagnostic-unused-variable`

Most errors are fixed temporarily by commenting out the unused bits and by adding a `FIXME: unused` comment.

The final fix is to either remove the unused bits or to fix the bugs which has to be done by someone who knows the intended behaviour.

Author: vkucera

PWGJE/Tasks/fullJetSpectra.cxx

@@ -1381,16 +1381,16 @@ struct FullJetSpectra {
 
     if (jetderiveddatautilities::selectTrigger(collision, jetderiveddatautilities::JTrigSel::JetChLowPt)) {
       registry.fill(HIST("hDetTrigcollisionCounter"), 13.5); // EMCAcceptedDetTrigCollWithLowChargedJetTriggers
-      eventAccepted = true;
+      // eventAccepted = true; // FIXME: unused
     }
     if (jetderiveddatautilities::selectTrigger(collision, jetderiveddatautilities::JTrigSel::JetChHighPt)) {
       registry.fill(HIST("hDetTrigcollisionCounter"), 14.5); // EMCAcceptedDetTrigCollWithHighChargedJetTriggers
-      eventAccepted = true;
+      // eventAccepted = true; // FIXME: unused
     }
 
     if (jetderiveddatautilities::selectTrigger(collision, jetderiveddatautilities::JTrigSel::JetFullLowPt) && jetderiveddatautilities::selectTrigger(collision, jetderiveddatautilities::JTrigSel::JetFullHighPt)) {
       registry.fill(HIST("hDetTrigcollisionCounter"), 15.5); // EMCAcceptedDetTrigCollWithLow+HighFullJetTriggers
-      eventAccepted = true;
+      // eventAccepted = true; // FIXME: unused
     }
 
     for (auto const& jet : jets) {

PWGJE/Tasks/statPromptPhoton.cxx

@@ -1552,7 +1552,7 @@ struct statPromptPhoton {
 
         while (chase) {
           if (visited.count(chaseindex)) {
-            chase = false;
+            // chase = false; // FIXME: unused
             break;
           }
           visited.insert(chaseindex);
@@ -1677,7 +1677,7 @@ struct statPromptPhoton {
 
         while (chase) {
           if (visited.count(chaseindex)) {
-            chase = false;
+            // chase = false; // FIXME: unused
             break;
           }
           visited.insert(chaseindex);

PWGJE/Tasks/v0QA.cxx

@@ -1601,7 +1601,7 @@ struct V0QA {
       if (!v0.has_mcParticle())
         continue;
 
-      int pdg = v0.mcParticle().pdgCode();
+      // int pdg = v0.mcParticle().pdgCode(); // FIXME: unused
 
       // Check V0 decay kinematics
       if (v0.isRejectedCandidate())
@@ -1612,7 +1612,7 @@ struct V0QA {
 
       auto pv0 = v0.mcParticle();
       auto mother = v0.mcMotherParticle();
-      pdg = mother.pdgCode();
+      auto pdg = mother.pdgCode();
 
       if (pdg == PDG_t::kXiMinus) {
         registry.fill(HIST("feeddown/XiMinusPtYLambdaPt"), mother.pt(), mother.y(), pv0.pt(), weight);
@@ -1638,7 +1638,7 @@ struct V0QA {
         if (!v0.has_mcParticle())
           continue;
 
-        int pdg = v0.mcParticle().pdgCode();
+        // int pdg = v0.mcParticle().pdgCode(); // FIXME: unused
 
         // Check V0 decay kinematics
         if (v0.isRejectedCandidate())
@@ -1649,7 +1649,7 @@ struct V0QA {
 
         auto pv0 = v0.mcParticle();
         auto mother = v0.mcMotherParticle();
-        pdg = mother.pdgCode();
+        auto pdg = mother.pdgCode();
 
         if (pdg == PDG_t::kXiMinus) {
           registry.fill(HIST("feeddown/JetPtXiMinusPtLambdaPt"), mcdjet.pt(), mother.pt(), pv0.pt(), weight);
@@ -1683,14 +1683,14 @@ struct V0QA {
             if (!v0sAreMatched(v0, pv0, jTracks))
               continue;
 
-            int pdg = v0.mcParticle().pdgCode();
+            // int pdg = v0.mcParticle().pdgCode(); // FIXME: unused
 
             // Check V0 decay kinematics
             if (v0.isRejectedCandidate())
               continue;
 
             auto mother = v0.mcMotherParticle();
-            pdg = mother.pdgCode();
+            auto pdg = mother.pdgCode();
             if (pdg == PDG_t::kXiMinus) {
               registry.fill(HIST("feeddown/JetsPtXiMinusPtLambdaPt"), mcpjet.pt(), mcdjet.pt(), mother.pt(), pv0.pt(), weight);
             }