Wicked actress Cynthia Erivo has taken to Instagram to blast a fan-made poster of the forthcoming musical movie. Wicked fans are blockbuster-bound as they count down the days to the big-budget movie adaptation. Directed by Jon M. Chu (Crazy Rich Asians), the fantasy musical is based on the beloved stage musical of the same name, itself boasting a rich heritage that dates back to the 1900 children’s novel The Wonderful Wizard of Oz. English actress and singer Cynthia Erivo is center stage as Elphaba Thropp, while Ariana Grande also stars as Galinda Upland. Trailers have been more than enough to…