fixup lint errors

trezor_agent/tests/test_client.py

@@ -114,6 +114,8 @@ def test_ssh_agent():
         assert r[1:] + s[1:] == SIG[1:]
 
         c.client.call_exception = ValueError
+
+        # pylint: disable=unused-argument
         def cancel_sign_identity(identity, challenge_hidden,
                                  challenge_visual, ecdsa_curve_name):
             raise c.client.call_exception(42, 'ERROR')
@@ -122,6 +124,7 @@ def test_ssh_agent():
         with pytest.raises(IOError):
             c.sign_ssh_challenge(label=label, blob=BLOB, visual='VISUAL')
 
+
 def test_utils():
     identity = mock.Mock(spec=[])
     identity.proto = 'https'