flake8 and don't fix a file with special way of handling thing

theano/gof/graph.py

@@ -873,7 +873,6 @@ def io_connection_pattern(inputs, outputs):
     # connected only to itself
     connect_pattern_by_var = {}
     nb_inputs = len(inputs)
-    nb_outputs = len(outputs)
 
     for i in range(nb_inputs):
         input = inputs[i]

theano/tests/test_flake8.py

@@ -223,6 +223,7 @@ whitelist_flake8 = [
     "sparse/sandbox/sp2.py",
     "sparse/sandbox/truedot.py",
     "sparse/sandbox/sp.py",
+    "gof/unify.py",
     "gof/__init__.py",
     "gof/tests/test_cmodule.py",
     "gof/tests/test_destroyhandler.py",