Make sure the correct callback name is displayed in websocket errors

src/cowboy_http_websocket.erl

@@ -378,11 +378,11 @@ handler_call(State=#state{handler=Handler, opts=Opts}, Req, HandlerState,
 			websocket_close(State, Req2, HandlerState2, {normal, shutdown})
 	catch Class:Reason ->
 		error_logger:error_msg(
-			"** Handler ~p terminating in websocket_handle/3~n"
+			"** Handler ~p terminating in ~p/3~n"
 			"   for the reason ~p:~p~n** Message was ~p~n"
 			"** Options were ~p~n** Handler state was ~p~n"
 			"** Request was ~p~n** Stacktrace: ~p~n~n",
-			[Handler, Class, Reason, Message, Opts,
+			[Handler, Callback, Class, Reason, Message, Opts,
 			 HandlerState, Req, erlang:get_stacktrace()]),
 		websocket_close(State, Req, HandlerState, {error, handler})
 	end.