In Warner Bros. movie “The Little Things,” Jared Leto is a friggin’ creep, so he probably was the one who killed a whole bunch of girls in Los Angeles. At least, that’s the theory of Denzel Washington’s cop. So long as they collar a criminal, his ad-hoc partner (Rami Malek) seems pretty much on board with all of that — and with Washington’s character’s own unsettling methods.