April 24 – Canadian stock index futures inched higher on Thursday as upbeat earnings from heavyweights such as Apple and Facebook outweighed weak results from Potash Corp . June futures on the S&P TSX index were up 0.06 percent at 0715 ET. No major economic events are scheduled in Canada. The Toronto Stock Exchange’s S&P/TSX composite index eased on Wednesday, with gains from some big energy producers offset by weakness in banks and a pullback in Valeant Pharmaceuticals’ shares. Dow Jones Industrial Average futures were up 0.3 percent at 0715 ET, S&P 500 futures were up 0. …