Remove trailing whitespace

Author: aadamson

testing/acceptance_test.py

@@ -825,7 +825,7 @@ def abuse_socket():
             # The socket itself will end up attached as a value in
             # _WARNING_DETAIL. We need to test that it is not serialized
             # (it can't be, so the test will fail if we try to).
-            @pytest.mark.filterwarnings('always')  
+            @pytest.mark.filterwarnings('always') 
             def test_func(tmpdir):
                 abuse_socket()
                 gc.collect()