[PATCH 6.1.y] iio: hid-sensor-prox: Restore lost scale assignments

[Sasha Levin <sashal@kernel.org>]

From: Zhang Lixu <lixu.zhang@intel.com>

[ Upstream commit 83ded7cfaccccd2f4041769c313b58b4c9e265ad ]

The variables `scale_pre_decml`, `scale_post_decml`, and `scale_precision`
were assigned in commit d68c592e02f6 ("iio: hid-sensor-prox: Fix scale not
correct issue"), but due to a merge conflict in
commit 9c15db92a8e5 ("Merge tag 'iio-for-5.13a' of
https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next"),
these assignments were lost.

Add back lost assignments and replace `st->prox_attr` with
`st->prox_attr[0]` because commit 596ef5cf654b ("iio: hid-sensor-prox: Add
support for more channels") changed `prox_attr` to an array.

Cc: stable@vger.kernel.org # 5.13+
Fixes: 9c15db92a8e5 ("Merge tag 'iio-for-5.13a' of https://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next")
Signed-off-by: Zhang Lixu <lixu.zhang@intel.com>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Link: https://patch.msgid.link/20250331055022.1149736-2-lixu.zhang@intel.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
[ changed st->prox_attr[0] array access to st->prox_attr single struct member ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iio/light/hid-sensor-prox.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iio/light/hid-sensor-prox.c b/drivers/iio/light/hid-sensor-prox.c
index f10fa2abfe725..02d289095c541 100644
--- a/drivers/iio/light/hid-sensor-prox.c
+++ b/drivers/iio/light/hid-sensor-prox.c
@@ -222,6 +222,11 @@ static int prox_parse_report(struct platform_device *pdev,
 	dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index,
 			st->prox_attr.report_id);
 
+	st->scale_precision = hid_sensor_format_scale(hsdev->usage,
+						      &st->prox_attr,
+						      &st->scale_pre_decml,
+						      &st->scale_post_decml);
+
 	return ret;
 }
 
-- 
2.39.5