Mike Ashley could be about to make the leap from sportswear to sofa retailing with yet another takeover deal, this time of the online furniture specialist Sofa.com. The Sports Direct founder has been on a buying spree over the past year, snapping up struggling retail chains including House of Fraser and the bike specialist Evans Cycles amid a high street crisis. He is also currently in the running to acquire the collapsed entertainment chain HMV. The tycoon’s latest target is…