One month after debuting in theaters, “The Smashing Machine” is now available to stream at home . The new sports biopic from A24 stars Dwayne “The Rock” Johnson as MMA fighter and UFC world champion Mark Kerr. “The Smashing Machine” follows Kerr’s career as an obsession with greatness made him a legend and nearly cost him everything in the process. Emily Blunt co-stars in the film as Dawn Staples, Kerr’s ex-wife. “The Smashing Machine” premiered at the Venice International Film Festival in