test__socket.py: minor fix to avoid false failures

greentest/test__socket.py

@@ -50,7 +50,7 @@ class TestTCP(greentest.TestCase):
         try:
             data = client.recv(1024)
         except socket.timeout:
-            assert time.time() - start >= 0.1, (time.time() - start)
+            assert time.time() - start >= 0.1 - 0.001, (time.time() - start)
         else:
             raise AssertionError('socket.timeout should have been raised, instead recv returned %r' % (data, ))