USB: serial: cyberjack: 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/cyberjack.c

@@ -50,7 +50,6 @@
 #define CYBERJACK_PRODUCT_ID	0x0100
 
 /* Function prototypes */
-static int cyberjack_attach(struct usb_serial *serial);
 static int cyberjack_port_probe(struct usb_serial_port *port);
 static int cyberjack_port_remove(struct usb_serial_port *port);
 static int  cyberjack_open(struct tty_struct *tty,
@@ -78,7 +77,7 @@ static struct usb_serial_driver cyberjack_device = {
 	.description =		"Reiner SCT Cyberjack USB card reader",
 	.id_table =		id_table,
 	.num_ports =		1,
-	.attach =		cyberjack_attach,
+	.num_bulk_out =		1,
 	.port_probe =		cyberjack_port_probe,
 	.port_remove =		cyberjack_port_remove,
 	.open =			cyberjack_open,
@@ -102,14 +101,6 @@ struct cyberjack_private {
 	short		wrsent;		/* Data already sent */
 };
 
-static int cyberjack_attach(struct usb_serial *serial)
-{
-	if (serial->num_bulk_out < serial->num_ports)
-		return -ENODEV;
-
-	return 0;
-}
-
 static int cyberjack_port_probe(struct usb_serial_port *port)
 {
 	struct cyberjack_private *priv;