By David Henry NEW YORK (Reuters) – Big U.S. banks including JPMorgan Chase & Co and Citigroup appear set for some earnings boost from a pick-up in the battered credit-card business, but a possible recession would pull consumers back and bring losses on outstanding loans. Last week, JPMorgan Chairman and CEO Jamie Dimon warned of growing recession risks and braced investors for a likely “hurricane.” In steady economic times, cards are one of the most profitable businesses for banks, and analysts say a continued upturn in card borrowing would bring relief for banks. When consumer spending crash…