usb: usbip: Convert timers to use timer_setup()

In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.

Cc: Valentina Manea <valentina.manea.m@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/usbip/vudc_transfer.c

@@ -311,9 +311,9 @@ static int transfer(struct vudc *udc,
 	return sent;
 }
 
-static void v_timer(unsigned long _vudc)
+static void v_timer(struct timer_list *t)
 {
-	struct vudc *udc = (struct vudc *) _vudc;
+	struct vudc *udc = from_timer(udc, t, tr_timer.timer);
 	struct transfer_timer *timer = &udc->tr_timer;
 	struct urbp *urb_p, *tmp;
 	unsigned long flags;
@@ -459,7 +459,7 @@ void v_init_timer(struct vudc *udc)
 {
 	struct transfer_timer *t = &udc->tr_timer;
 
-	setup_timer(&t->timer, v_timer, (unsigned long) udc);
+	timer_setup(&t->timer, v_timer, 0);
 	t->state = VUDC_TR_STOPPED;
 }