UPDATE 1-U.S. links Iran's state oil company to Revolutionary Guards

* Congress asked Treasury to look for link * Finding link allows for additional sanctions on banks * Treasury did not find link with oil tanker company WASHINGTON, Sept 24 (Reuters) - The U.S. governmentofficially linked Iran's state oil company to the country'sIslamic Revolutionary Guard Corps on Monday, a determinationthat enables Washington to apply new sanctions on foreign banksdealing with ...