Wall St. inches up with energy gain, Wal-Mart

U.S. stocks ended up slightly on Thursday as Brent oil's rise above $50 a barrel boosted energy shares and an upbeat outlook lifted Wal-Mart to a 14-month high. Wal-Mart rose 1.9 percent to end at $74.30 after the retailer reported a better-than-expected quarterly profit and raised its fiscal-year outlook.