net/can/mscan: Fix buggy listen only mode setting

This patch fixes an issue introduced recently with commit
452448f928.

CC: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/can/mscan/mscan.c

@@ -581,7 +581,7 @@ static int mscan_open(struct net_device *dev)
 
 	priv->open_time = jiffies;
 
-	if (ctrlmode.flags & CAN_CTRLMODE_LISTENONLY)
+	if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
 		setbits8(&regs->canctl1, MSCAN_LISTEN);
 	else
 		clrbits8(&regs->canctl1, MSCAN_LISTEN);