Function uvc_src::uvc_get_zoom_rel

pub unsafe extern "C" fn uvc_get_zoom_rel(
    devh: *mut uvc_device_handle_t, 
    zoom_rel: *mut i8, 
    digital_zoom: *mut u8, 
    speed: *mut u8, 
    req_code: uvc_req_code
) -> uvc_error_t