Recession fears also echoed through dire warnings from Nike Inc NKE.N and cruise operator Carnival Corp CCL.N, both citing inflation-related margin pressures. By Stephen Culp NEW YORK, Sept 30 (Reuters) - Wall Street wobbled to the end of the S&P 500's steepest September decline since the global financial crisis on Friday, closing the books on a tumultuous quarter fraught with historically hot inflation, rising interest rates and recession fears. Corporate earnings reports for the quarter that ends with Friday's closing bell will begin landing in a few weeks, and analyst expectations are trending downward.