File photograph of traders working at the post that trades Herbalife stock on the floor of the New York Stock ExchangeBy means of Martinne Geller and Emily Flitter (Reuters) – In a blow to one of the vital world's biggest accounting firms, KPMG mentioned it resigned as auditor of two U.S. firms amid an FBI investigation into insider buying and selling allegations involving leaked data and a former senior associate. The 2 California-primarily based firms – nutritional merchandise team Herbalife Ltd and footwear maker Skechers USA Inc – said one by one on Tuesday that KPMG had give up as their auditor in reference to the leaks. The FBI's Los Angeles place of work is investigating the topic, in line with a supply conversant in the location. …