By Hanna Rantala LONDON (Reuters) -U.S. rock star Bruce Springsteen made a surprise appearance on the London Film Festival red carpet on Wednesday, lending his support to the cast and makers of a new biographical movie about his life. "Springsteen: Deliver Me from Nowhere" stars "The Bear" actor Jeremy Allen White as the multiple Grammy winner. But instead of focusing on his high-flying career, it offers a raw portrayal of the person behind the music. Directed and co-written by Scott Cooper, the film is based on the book of the same name by Warren Zanes. It follows a young Springsteen, on the cusp of hitting the big time, struggling with his inner demons and childhood trauma while writing the stark 1982 album "Nebraska". White said the drama, which also delves into Springsteen's fraught re

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