[Bugs] #3037 UNSP: Distance fails to start measuring

[Sugar Labs Bugs]

#3037: Distance fails to start measuring
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    Reporter:  greenfeld                  |          Owner:  RafaelOrtiz                
        Type:  defect                     |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  Distance                   |        Version:  0.92.x                     
    Severity:  Major                      |       Keywords:  11.3.0                     
Distribution:  OLPC                       |   Status_field:  Unconfirmed                
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 Distance-29 fails to start measuring on OLPC 11.3.0 os2.

 Both the starting computer and the one joining the shared session log the
 following exception:

 Traceback (most recent call last):
   File "/home/olpc/Activities/Distance.activity/activity.py", line 291, in
 _helper_thread
     dt = arange.measure_dt_seq(self.main_socket, self.initiating,
 self._change_message)
   File "/home/olpc/Activities/Distance.activity/arange.py", line 418, in
 measure_dt_seq
     mls = compute_mls(R)
   File "/home/olpc/Activities/Distance.activity/arange.py", line 84, in
 compute_mls
     return LFSR(Rf, [i - 1 for i in taps[n]], 2**n - 1)
 NameError: global name 'Rf' is not defined

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Ticket URL: <http://bugs.sugarlabs.org/ticket/3037>
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