Function ostree_sys::ostree_checksum_file_async

pub unsafe extern "C" fn ostree_checksum_file_async(
    f: *mut GFile, 
    objtype: OstreeObjectType, 
    io_priority: c_int, 
    cancellable: *mut GCancellable, 
    callback: GAsyncReadyCallback, 
    user_data: gpointer
)