By Lewis Krauskopf, Devik Jain and Anisha Sircar (Reuters) – Wall Street’s main indexes ended little changed in choppy trading on Wednesday after Federal Reserve Chair Jerome Powell spoke to the central bank’s aim to bring down inflation. After opening lower, major U.S. indexes had erased losses following Powell’s testimony before a Senate committee. He said the Fed is “strongly committed” to bringing down inflation that is running at a 40-year high while policymakers are not trying to cause a recession in the process. Investors are trying to assess how far stocks can fall as they weigh risks …