Jamie Waylett -- the guy who played Vincent Crabbe in the "Harry Potter" movies -- has been sentenced to spend TWO YEARS in a British prison for participating in the London riots last year. As we previously reported, cops believed Waylett was packing a Molotov cocktail while looting champagne from…

The actor who played Crabbe the bully in 6 of the "Harry Potter" movies has been charged with possession of a homemade bomb ... which cops say he intended to detonate during the London riots. According to U.K. reports, cops believe 22-year-old Jamie Waylett was packing a Molotov cocktail while…