qeth: no write permission for readonly sysattr

User is not allowed to write into bridge_state sysfs file.
Fixed attribute not mislead the user

Signed-off-by: Lakhvich Dmitriy <[e-mail]>
Signed-off-by: Ursula Braun <[e-mail]>
Reported-by: Peter Oberparleiter <[e-mail]>
Reviewed-by: Eugene Crosser <[e-mail]>
Reviewed-by: Thomas Richter <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/s390/net/qeth_l2_sys.c

···
 	return qeth_bridge_port_role_state_show(dev, attr, buf, 1);
 }
 
-static DEVICE_ATTR(bridge_state, 0644, qeth_bridge_port_state_show,
+static DEVICE_ATTR(bridge_state, 0444, qeth_bridge_port_state_show,
 		   NULL);
 
 static ssize_t qeth_bridgeport_hostnotification_show(struct device *dev,