(Reuters) – Citigroup Inc reported a marginal fall in adjusted quarterly profit from ongoing businesses after the Federal Reserve’s decision to continue its bond-buying program for longer than expected slowed trading by clients. Third-quarter net income, adjusted for certain items, slipped to $3.26 billion, or $1.02 per share, from $3.27 billion, or $1.06 per share a year earlier, the third-largest U.S. bank said on Tuesday. …