* Traders nervous about futures' premium to cash * Feeders wilt; premium to cash, technical selling * Hogs rise with Dow surge, cash price expectations By Theopolis Waters CHICAGO, Jan 2 (Reuters) - CME live cattle ended narrowly mixed on Wednesday, with uneasiness about futures' premium to last week's cash cattle prices eroding morning gains fueled by the U.S. fiscal deal, analysts and traders said. An agreement by Congress to avoid automatic year-end spending cuts and tax