fix typo

noblogsmv/state.py

@@ -267,7 +267,7 @@ class RingBuffer(object):
             self.ptr = 0
 
     def get_values(self):
-        return values[self.ptr:] + values[:self.ptr]
+        return self.values[self.ptr:] + self.values[:self.ptr]
 
 
 class StatsThread(threading.Thread):