iio: adc: ti-ads1119: fix information leak in triggered buffer

iio: adc: ti-ads1119: fix information leak in triggered buffer

The 'scan' local struct is used to push data to user space from a
triggered buffer, but it has a hole between the sample (unsigned int)
and the timestamp. This hole is never initialized.

Initialize the struct to zero before using it to avoid pushing
uninitialized information to userspace.

Cc: stable@vger.kernel.org
Fixes: a9306887eba4 ("iio: adc: ti-ads1119: Add driver")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://patch.msgid.link/20241125-iio_memset_scan_holes-v1-2-0cb6e98d895c@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>