Core: Fix warnings

src/server/game/AI/CreatureAI.h

@@ -117,7 +117,7 @@ class CreatureAI : public UnitAI
         virtual void SpellHitTarget(Unit* /*target*/, SpellInfo const* /*spell*/) {}
 
         // Called when the creature is target of hostile action: swing, hostile spell landed, fear/etc)
-        virtual void AttackedBy(Unit* attacker) {}
+        virtual void AttackedBy(Unit* /*attacker*/) {}
         virtual bool IsEscorted() { return false; }
 
         // Called when creature is spawned or respawned (for reseting variables)