Fix dialyze errors

Author: MarcialRosales

deps/rabbitmq_auth_backend_oauth2/src/rabbit_oauth2_provider.erl

@@ -152,8 +152,8 @@ get_signing_key(KeyId, OAuthProviderId) ->
     case maps:get(KeyId, get_signing_keys(OAuthProviderId), undefined) of 
         undefined -> 
             case oauth2_client:get_opaque_token_signing_key(KeyId) of 
-                {error, _} -> undefined;
-                {ok, SK} -> SK
+                {ok, SK} -> SK;
+                {error, _} -> undefined                
             end;
         V -> V 
     end.

deps/rabbitmq_auth_backend_oauth2/src/rabbit_oauth2_schema.erl

@@ -197,7 +197,7 @@ translate_endpoint_params(Variable, Conf) ->
          <- Params0].
 
 -spec translate_opaque_token_signing_key([{list(), binary()}]) -> 
-    [{binary(), binary()}].
+    [{atom(), binary()}].
 translate_opaque_token_signing_key(Conf) ->
     Params0 = cuttlefish_variable:filter_by_prefix("auth_oauth2.opaque_token_signing_key",
         Conf),