fix pylint warnings

.pylintrc

@@ -1,2 +1,2 @@
 [MESSAGES CONTROL]
-disable=invalid-name, missing-docstring, locally-disabled, unbalanced-tuple-unpacking
+disable=invalid-name, missing-docstring, locally-disabled, unbalanced-tuple-unpacking,no-else-return

trezor_agent/device/interface.py

@@ -82,7 +82,7 @@ class Identity(object):
         s = io.BytesIO(bytearray(digest))
 
         hardened = 0x80000000
-        addr_0 = [13, 17][bool(ecdh)]
+        addr_0 = 17 if bool(ecdh) else 13
         address_n = [addr_0] + list(util.recv(s, '<LLLL'))
         return [(hardened | value) for value in address_n]
 

trezor_agent/gpg/tests/test_decode.py

@@ -41,8 +41,7 @@ def public_key_path(request):
 
 def test_gpg_files(public_key_path):  # pylint: disable=redefined-outer-name
     with open(public_key_path, 'rb') as f:
-        packets = list(decode.parse_packets(f))
-        assert len(packets) > 0
+        assert list(decode.parse_packets(f))
 
 
 def test_has_custom_subpacket():