usb: gadget: goku_udc: use NULL instead of 0

'req' is a pointer; thus, use NULL instead of 0
to fix the following sparse warning:

drivers/usb/gadget/goku_udc.c:775:13: warning: Using plain integer as NULL pointer

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/drivers/usb/gadget/goku_udc.c b/drivers/usb/gadget/goku_udc.c
index 52dd6cc..c64deb9 100644 (file)
--- a/drivers/usb/gadget/goku_udc.c
+++ b/drivers/usb/gadget/goku_udc.c
@@ -772,7 +772,7 @@ goku_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
 
        } /* else pio or dma irq handler advances the queue. */
 
-       if (likely(req != 0))
+       if (likely(req != NULL))
                list_add_tail(&req->queue, &ep->queue);
 
        if (likely(!list_empty(&ep->queue))