fixed pyflakes error in affine hull

Author: Jonathan Kliem

src/sage/geometry/polyhedron/base.py

@@ -7802,7 +7802,7 @@ def affine_hull(self, as_affine_map=False, orthogonal=False, orthonormal=False,
                 A = M.gram_schmidt(orthonormal=orthonormal)[0]
             if as_affine_map:
                 return linear_transformation(A, side='right'), -A*vector(A.base_ring(), self.vertices()[0])
-            return Polyhedron([A*vector(A.base_ring(), v) for v in Q.vertices()], base_ring=A.base_ring())
+            return Polyhedron([A*vector(A.base_ring(), w) for w in Q.vertices()], base_ring=A.base_ring())
 
         # translate one vertex to the origin
         v0 = self.vertices()[0].vector()