usb: gadget: Assign boolean values to a bool variable

Fix the following coccicheck warnings:

./drivers/usb/gadget/udc/udc-xilinx.c:846:1-17: WARNING: Assignment of
0/1 to bool variable.
Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Link: https://lore.kernel.org/r/1612678696-15794-1-git-send-email-jiapeng.chong@linux.alibaba.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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

@@ -843,8 +843,8 @@ static int __xudc_ep_enable(struct xusb_ep *ep,
 		break;
 	}
 
-	ep->buffer0ready = 0;
-	ep->buffer1ready = 0;
+	ep->buffer0ready = false;
+	ep->buffer1ready = false;
 	ep->curbufnum = 0;
 	ep->rambase = rambase[ep->epnumber];
 	xudc_epconfig(ep, udc);
@@ -868,11 +868,11 @@ static int __xudc_ep_enable(struct xusb_ep *ep,
 	if (ep->epnumber && !ep->is_in) {
 		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
 			      1 << ep->epnumber);
-		ep->buffer0ready = 1;
+		ep->buffer0ready = true;
 		udc->write_fn(udc->addr, XUSB_BUFFREADY_OFFSET,
 			     (1 << (ep->epnumber +
 			      XUSB_STATUS_EP_BUFF2_SHIFT)));
-		ep->buffer1ready = 1;
+		ep->buffer1ready = true;
 	}
 
 	return 0;