Fix whitespace.

src/allmydata/immutable/downloader/node.py

@@ -50,7 +50,7 @@ class DownloadNode(object):
     callers use CiphertextFileNode instead."""
 
     default_max_segment_size = DEFAULT_MAX_SEGMENT_SIZE
-    
+
     # Share._node points to me
     def __init__(self, verifycap, storage_broker, secret_holder,
                  terminator, history, download_status):

src/allmydata/test/test_system.py

@@ -1831,7 +1831,6 @@ class SystemTest(SystemTestMixin, RunBinTahoeMixin, unittest.TestCase):
             c.encoding_params["n"] = 1
 
         await self._upload_download_different_max_segment(128 * 1024, 1024 * 1024)
-        
         await self._upload_download_different_max_segment(1024 * 1024, 128 * 1024)