By Luc Cohen and Jonathan Stempel NEW YORK (Reuters) -Lawyer Michael Avenatti, who rose to fame for taking on then-U.S. President Donald Trump before a string of criminal charges ended his legal career, was convicted on Friday of defrauding a former client, porn star Stormy Daniels. Avenatti, who faces up to 22 years behind bars, had pleaded not guilty to embezzling nearly $300,000 in book proceeds intended for Daniels. The verdict by a federal jury in Manhattan followed a two-week trial in which the brash, 50-year-old lawyer represented himself. Avenatti, who is based in Los Angeles, agreed t…