dstat_comm: Flush correct pipe.

dstat_interface/dstat_comm.py

@@ -205,8 +205,8 @@ class SerialConnection(GObject.Object):
     def flush_data(self):
         self.assert_connected()
         
-        while self.proc_pipe_p.poll() is True:
-            self.proc_pipe_p.recv()
+        while self.data_pipe_p.poll() is True:
+            self.data_pipe_p.recv()
     
     def send_ctrl(self, ctrl):
         self.assert_connected()