USB: serial: kobil_sct: simplify endpoint check

Simplify the endpoint sanity check by letting core verify that the
required endpoints are present.

Signed-off-by: Johan Hovold <johan@kernel.org>

drivers/usb/serial/kobil_sct.c

@@ -51,7 +51,6 @@
 
 
 /* Function prototypes */
-static int kobil_attach(struct usb_serial *serial);
 static int kobil_port_probe(struct usb_serial_port *probe);
 static int kobil_port_remove(struct usb_serial_port *probe);
 static int  kobil_open(struct tty_struct *tty, struct usb_serial_port *port);
@@ -87,7 +86,7 @@ static struct usb_serial_driver kobil_device = {
 	.description =		"KOBIL USB smart card terminal",
 	.id_table =		id_table,
 	.num_ports =		1,
-	.attach =		kobil_attach,
+	.num_interrupt_out =	1,
 	.port_probe =		kobil_port_probe,
 	.port_remove =		kobil_port_remove,
 	.ioctl =		kobil_ioctl,
@@ -115,16 +114,6 @@ struct kobil_private {
 };
 
 
-static int kobil_attach(struct usb_serial *serial)
-{
-	if (serial->num_interrupt_out < serial->num_ports) {
-		dev_err(&serial->interface->dev, "missing interrupt-out endpoint\n");
-		return -ENODEV;
-	}
-
-	return 0;
-}
-
 static int kobil_port_probe(struct usb_serial_port *port)
 {
 	struct usb_serial *serial = port->serial;