Multiple shutdown endless loop

[NINI1988]

When shutting down the remote can multiple times, an endless loop occur.

In python-can/bus.py#L482 double shutdown is handled by just returning.
But in in this project, the first time everything is handled correctly and an WebsocketClosed exception is thrown and handled correctly.
But the second time, the recv in protocol.py#L33 with raise a ValueError("An error occurred: file descriptor cannot be a negative integer (-1)"), which will be caught by the surrounding catch and will never get out to be caught as WebsocketClosed.

import can

can1: can.BusABC = can.Bus(f"ws://ip:54701/", interface="remote")

can1.shutdown()
can1.shutdown()