drivers/usb/gadget/udc: Assign boolean values to a bool variable

Fix the following coccicheck warnings:

./drivers/usb/gadget/udc/udc-xilinx.c:1957:2-18: WARNING:
Assignment of 0/1 to bool variable.
Reported-by: NAbaci Robot <abaci@linux.alibaba.com>
Acked-by: NFelipe Balbi <balbi@kernel.org>
Signed-off-by: NJiapeng Zhong <abaci-bugfix@linux.alibaba.com>
Link: https://lore.kernel.org/r/1610615002-66235-1-git-send-email-abaci-bugfix@linux.alibaba.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/udc/udc-xilinx.c

@@ -1954,7 +1954,7 @@ static void xudc_nonctrl_ep_handler(struct xusb_udc *udc, u8 epnum,
 	if (intrstatus & (XUSB_STATUS_EP0_BUFF1_COMP_MASK << epnum))
 		ep->buffer0ready = 0;
 	if (intrstatus & (XUSB_STATUS_EP0_BUFF2_COMP_MASK << epnum))
-		ep->buffer1ready = 0;
+		ep->buffer1ready = false;
 
 	if (list_empty(&ep->queue))
 		return;