Fix some memory leak from CreateTamedPetFrom.

src/server/game/Spells/SpellEffects.cpp

@@ -3828,7 +3828,10 @@ void Spell::EffectTameCreature(SpellEffIndex /*effIndex*/)
 
     Pet* pet = m_caster->CreateTamedPetFrom(creatureTarget, m_spellInfo->Id);
     if (!pet)                                               // in very specific state like near world end/etc.
+    {
+        delete pet;
         return;
+    }
 
     // "kill" original creature
     creatureTarget->DespawnOrUnsummon();
@@ -7014,7 +7017,10 @@ void Spell::EffectCreateTamedPet(SpellEffIndex effIndex)
     uint32 creatureEntry = m_spellInfo->Effects[effIndex].MiscValue;
     Pet* pet = unitTarget->CreateTamedPetFrom(creatureEntry, m_spellInfo->Id);
     if (!pet)
+    {
+        delete pet;
         return;
+    }
 
     // add to world
     pet->GetMap()->AddToMap(pet->ToCreature());

src/server/scripts/Commands/cs_npc.cpp

@@ -1131,6 +1131,7 @@ public:
         {
             handler->PSendSysMessage (LANG_CREATURE_NON_TAMEABLE, cInfo->Entry);
             handler->SetSentErrorMessage (true);
+            delete pet;
             return false;
         }