usb: gadget: f_hid: idle uses the highest byte for duration

SET_IDLE value must be shifted 8 bits to the right to get duration.
This confirmed by USBCV test.

Fixes: afcff6dc ("usb: gadget: f_hid: added GET_IDLE and SET_IDLE handlers")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Maxim Devaev <mdevaev@gmail.com>
Link: https://lore.kernel.org/r/20210727185800.43796-1-mdevaev@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>