fix fixed point example

examples/fixed_point/heat_equation.py

@@ -77,13 +77,6 @@ def compute(args):
     pseudo_dt = ScalarParameter(name='pseudo_dt', dtype=args.dtype, min_value=eps,
                                 initial_value=eps, quiet=True)
 
-    # Topologies (needed to fix redistributes between the two problems)
-    topo_nogh = CartesianTopology(
-        domain=box,
-        backend=Backend.HOST,
-        discretization=CartesianDiscretization(npts, ghosts=(0, 0, 0), default_boundaries=True),
-        mpi_params=mpi_params)
-
     # Operator for setting iterative method
     if impl is Implementation.OPENCL:
         (x0, x1, x2) = box.frame.coords