NFL commissioner Roger Goodell is returning to Capitol Hill next week... this time to testify about the league's court battler with Minnesota Vikings pat and Kevin Williams.Goodell and Demaurice Smith, head of the NFL players union, are among the witnesses scheduled before a house energy and commerce subcommittee next Tuesday.The league had tried to suspend the Williams', for violating its anti-doping policy.But last month, a federal appeals court essentially allowed them to continue playing while the players' lawsuit proceeds in state court.