chore(Scripts/Misc): Cleanup some more JustDied hooks (#9768)

src/server/game/DungeonFinding/LFGMgr.cpp

@@ -577,8 +577,7 @@ namespace lfg
                             rDungeonId = (*dungeons.begin());
                             sScriptMgr->OnPlayerQueueRandomDungeon(player, rDungeonId);
                         }
-                        // No break on purpose (Random can only be dungeon or heroic dungeon)
-                        [[fallthrough]];
+                        [[fallthrough]]; // On purpose (Random can only be dungeon or heroic dungeon)
                     case LFG_TYPE_HEROIC:
                     case LFG_TYPE_DUNGEON:
                         if (isRaid)

src/server/game/Entities/GameObject/GameObject.cpp

@@ -562,8 +562,6 @@ void GameObject::Update(uint32 diff)
                         m_lootState = GO_READY;                         // for other GOis same switched without delay to GO_READY
                         break;
                 }
-
-                // NO BREAK for switch (m_lootState)
                 [[fallthrough]];
             }
         case GO_READY:

src/server/game/Entities/Unit/Unit.cpp

@@ -17198,8 +17198,10 @@ void Unit::Kill(Unit* killer, Unit* victim, bool durabilityLoss, WeaponAttackTyp
             killer->ToCreature()->AI()->KilledUnit(victim);
 
         // Call creature just died function
-        if (creature->IsAIEnabled)
-            creature->AI()->JustDied(killer ? killer : victim);
+        if (CreatureAI* ai = creature->AI())
+        {
+            ai->JustDied(killer);
+        }
 
         if (TempSummon* summon = creature->ToTempSummon())
             if (Unit* summoner = summon->GetSummonerUnit())