Input: kbtab - fix incorrect size parameter in usb_buffer_free

The size allocated by usb_buffer_alloc() is 8, however the size passed
to usb_buffer_free() is 10.

Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/tablet/kbtab.c b/drivers/input/tablet/kbtab.c
index 6682b17b..76b5d52 100644
--- a/drivers/input/tablet/kbtab.c
+++ b/drivers/input/tablet/kbtab.c
@@ -182,7 +182,7 @@
 	return 0;
 
  fail3:	usb_free_urb(kbtab->irq);
- fail2:	usb_buffer_free(dev, 10, kbtab->data, kbtab->data_dma);
+ fail2:	usb_buffer_free(dev, 8, kbtab->data, kbtab->data_dma);
  fail1:	input_free_device(input_dev);
 	kfree(kbtab);
 	return error;
@@ -197,7 +197,7 @@
 		usb_kill_urb(kbtab->irq);
 		input_unregister_device(kbtab->dev);
 		usb_free_urb(kbtab->irq);
-		usb_buffer_free(interface_to_usbdev(intf), 10, kbtab->data, kbtab->data_dma);
+		usb_buffer_free(interface_to_usbdev(intf), 8, kbtab->data, kbtab->data_dma);
 		kfree(kbtab);
 	}
 }