Fix dialyze errors

Author: MarcialRosales

deps/oauth2_client/src/oauth2_client.erl

@@ -638,9 +638,7 @@ map_proxy_to_httpc_option(ProxyOptions) ->
     case ProxyOptions of
         undefined -> []; 
         Proxy     -> case {Proxy#proxy_options.host, Proxy#proxy_options.port} of 
-            {undefined, 0} -> [];
             {_, 0}         -> [];
-            {undefined, _} -> [];
             {Host, Port}   -> P = {{Host, Port},[]},
                               [{proxy, P}]                
             end

deps/rabbitmq_auth_backend_oauth2/src/uaa_jwt.erl

@@ -42,8 +42,7 @@ add_signing_key(KeyId, Type, Value) ->
     end.
 
 -spec update_jwks_signing_keys(oauth_provider()) -> ok | {error, term()}.
-update_jwks_signing_keys(#oauth_provider{id = Id, jwks_uri = JwksUrl,
-        ssl_options = SslOptions, proxy_options = ProxyOptions} = OAuthProvider) ->
+update_jwks_signing_keys(#oauth_provider{id = Id} = OAuthProvider) ->
     rabbit_log:debug("Downloading signing keys from OauthProvider: ~tp",
         [Id]),
     case oauth2_client:get_jwks(OAuthProvider) of