iio: core: iio_chan_spec_ext_info: Add private handle
There is currently no user, but we might need it in future. So better add it now, before we have to convert drivers afterwards. Signed-off-by: NMichael Hennerich <michael.hennerich@analog.com> Acked-by: NJonathan Cameron <jic23@kernel.org> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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