Pass code check.

examples/tree1024.py

@@ -17,7 +17,7 @@ def TreeNet( depth=1, fanout=2, **kwargs ):
     "Convenience function for creating tree networks."
     topo = TreeTopo( depth, fanout )
     return Mininet( topo, **kwargs )
-    
+
 if __name__ == '__main__':
     setLogLevel( 'info' )
     init()