Fix TimerBase call to non-existent method.

dopplershift · dopplershift · commit 28514ca7decb · 2012-07-20T09:58:40.000-05:00
diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
@@ -1042,7 +1042,7 @@ def start(self, interval=None):
         to reset the timer interval first if provided.
         '''
         if interval is not None:
-            self.set_interval(interval)
+            self._set_interval(interval)
         self._timer_start()
 
     def stop(self):
