Remove unnecessary loop in test_keymaster.py

The ignored_secret variable wasn't being used.

Change-Id: Ia659f3672941f9bb86054ce6cafbbe6fe7ccafbc
Related-Change: I1cd9a97c4e8d87d7c065866e7ad3a9e748ff19ab

test/unit/common/middleware/crypto/test_keymaster.py

@@ -153,8 +153,6 @@ class TestKeymaster(unittest.TestCase):
             for conf_val in (bytes(enc_secret), unicode(enc_secret),
                              enc_secret[:30] + '\n' + enc_secret[30:],
                              enc_secret[:30] + '\r\n' + enc_secret[30:]):
-                for ignored_secret in ('invalid! but ignored!',
-                                       'xValidButIgnored' * 10):
                 mock_readconf.reset_mock()
                 mock_readconf.return_value = {
                     'encryption_root_secret': conf_val}