commit f7a28df7db84eb3410e9eca37832efa5aed93338 upstream. If we have an unexpected number of channels then return -EINVAL instead of returning success. Fixes: df38a4a72a3b ("iio: dac: add TI DAC5571 family support") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Link: https://lore.kernel.org/r/20210816183954.GB2068@kili Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>