Remove unneeded del

Author: effigies

niworkflows/viz/plots.py

@@ -1062,7 +1062,6 @@ def get_surface_meshes(density, surface_type):
     if output_file is not None:
         figure.savefig(output_file, bbox_inches="tight")
         plt.close(figure)
-        del figure
         return output_file
 
     return figure