[PATCH] USB: fixes for usb-skeleton.c

I've found minor errors in usb-skeleton.c. First, there is no valid
value of interface->minor in assignment to dev->minor. Second, when
calling usb_deregister_dev the interface->minor must be valid or else
minor isn't deregistered.

drivers/usb/usb-skeleton.c

@@ -526,7 +526,6 @@ static int skel_probe(struct usb_interface *interface, const struct usb_device_i
 	init_MUTEX (&dev->sem);
 	dev->udev = udev;
 	dev->interface = interface;
-	dev->minor = interface->minor;
 
 	/* set up the endpoint information */
 	/* check out the endpoints */
@@ -606,6 +605,7 @@ static int skel_probe(struct usb_interface *interface, const struct usb_device_i
 		goto error;
 	}
 
+	dev->minor = interface->minor;
 
 	/* let the user know what node this device is now attached to */
 	info ("USB Skeleton device now attached to USBSkel-%d", dev->minor);
@@ -641,9 +641,6 @@ static void skel_disconnect(struct usb_interface *interface)
 
 	down (&dev->sem);
 
-	/* disable open() */
-	interface->minor = -1;
-
 	minor = dev->minor;
 
 	/* give back our minor */