CANADA STOCKS-TSX closes lower as U.S. budget fears linger

* TSX closes down 14.90 points, or 0.12 percent, at 12,370.80 * Index weighed down by energy, materials sectors By Allison Martell TORONTO, Dec 24 (Reuters) - Canada's main stock index ended down after a quiet, shortened Christmas Eve trading session on Monday, as oil prices extended their retreat on worries about U.S. 'fiscal cliff' budget measures, pulling energy shares lower. With U.S. lawmakers suspending talks on the spending cuts and tax increases that could send the econo