USB: g_printer: fix handling zero-length packet

g_printer doesn't have to check whether the data size is a multiple of
MaxPacketSize, because device controller driver already make that check.

Signed-off-by: SangSu Park<[email protected]>
Cc: Alan Stern <[email protected]>
Cc: David Brownell <[email protected]>
Cc: Greg KH <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: sangsu

drivers/usb/gadget/printer.c

@@ -1278,8 +1278,7 @@ printer_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 	/* respond with data transfer before status phase? */
 	if (value >= 0) {
 		req->length = value;
-		req->zero = value < wLength
-				&& (value % gadget->ep0->maxpacket) == 0;
+		req->zero = value < wLength;
 		value = usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
 		if (value < 0) {
 			DBG(dev, "ep_queue --> %d\n", value);