Fixed reference in Python Library

Libraries/RNode.py

@@ -310,7 +310,7 @@ class RNodeInterface():
 
     def updateBitrate(self):
         try:
-            self.bitrate = self.r_sf * ( (4.0/self.cr) / (math.pow(2,self.r_sf)/(self.r_bandwidth/1000)) ) * 1000
+            self.bitrate = self.r_sf * ( (4.0/self.r_cr) / (math.pow(2,self.r_sf)/(self.r_bandwidth/1000)) ) * 1000
             self.bitrate_kbps = round(self.bitrate/1000.0, 2)
             self.log(str(self)+" On-air bitrate is now "+str(self.bitrate_kbps)+ " kbps", RNodeInterface.LOG_DEBUG)
         except: