can: slcan: use the BIT() helper

Use the BIT() helper instead of an explicit shift.

Link: https://lore.kernel.org/all/20220628163137.413025-2-dario.binacchi@amarulasolutions.comSigned-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Tested-by: Jeroen Hofstee <jhofstee@victronenergy.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/slcan.c

@@ -413,7 +413,7 @@ static int slc_open(struct net_device *dev)
 	if (sl->tty == NULL)
 		return -ENODEV;
 
-	sl->flags &= (1 << SLF_INUSE);
+	sl->flags &= BIT(SLF_INUSE);
 	netif_start_queue(dev);
 	return 0;
 }