usb: gadget: remove bufsiz from struct usb_composite_dev

there is no read user of bufsiz, its content is available via
USB_COMP_EP0_BUFSIZ. Remove it.
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/gadget/composite.c

@@ -1449,7 +1449,6 @@ static int composite_bind(struct usb_gadget *gadget,
 	cdev->req->complete = composite_setup_complete;
 	gadget->ep0->driver_data = cdev;
 
-	cdev->bufsiz = USB_COMP_EP0_BUFSIZ;
 	cdev->driver = composite;
 
 	/*

include/linux/usb/composite.h

@@ -318,7 +318,6 @@ extern void usb_composite_setup_continue(struct usb_composite_dev *cdev);
  * struct usb_composite_device - represents one composite usb gadget
  * @gadget: read-only, abstracts the gadget's usb peripheral controller
  * @req: used for control responses; buffer is pre-allocated
- * @bufsiz: size of buffer pre-allocated in @req
  * @config: the currently active configuration
  *
  * One of these devices is allocated and initialized before the
@@ -349,7 +348,6 @@ extern void usb_composite_setup_continue(struct usb_composite_dev *cdev);
 struct usb_composite_dev {
 	struct usb_gadget		*gadget;
 	struct usb_request		*req;
-	unsigned			bufsiz;
 
 	struct usb_configuration	*config;