MNT: A bit of clean up for osx backend

dopplershift · dopplershift · commit 90a53951b847 · 2017-10-20T14:34:11.000-06:00
Remove unused import and simplify a conditional.
diff --git a/lib/matplotlib/backends/backend_macosx.py b/lib/matplotlib/backends/backend_macosx.py
@@ -1,8 +1,6 @@
 from __future__ import (absolute_import, division, print_function,
                         unicode_literals)
 
-import six
-
 import os
 
 from matplotlib._pylab_helpers import Gcf
@@ -99,10 +97,9 @@ def get_renderer(self, cleared=False):
     def _draw(self):
         renderer = self.get_renderer()
 
-        if not self.figure.stale:
-            return renderer
+        if self.figure.stale:
+            self.figure.draw(renderer)
 
-        self.figure.draw(renderer)
         return renderer
 
     def draw(self):
