iio: remove unneeded assignment in __iio_format_value

Trivial cleanup in __iio_format_value() for the IIO_VAL_FRACTIONAL case
where tmp1 = vals[1] assignment is unneeded and irrelevant since tmp1 is
immediately overwritten by the subsequent div_s64_rem() call.

Signed-off-by: Matteo Martelli <matteomartelli3@gmail.com>
Link: https://patch.msgid.link/20240730-iio-clean-fmt-value-v1-1-3e1c3deafc33@gmail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>