Fix some memory leak from CreateTamedPetFrom.

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;
         }