[PATCH v2] iio: adc: meson-saradc: fix calibration buffer leak on error

[Felix Gu <ustc.gu@gmail.com>]

meson_sar_adc_temp_sensor_init() allocates a buffer with
nvmem_cell_read(), but the old code leaked it if
syscon_regmap_lookup_by_phandle() failed.

Fix this by adding missing kfree(buf).

Fixes: d6f2eac64403 ("iio: adc: meson: no devm for nvmem_cell_get")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
---
Changes in v2:
- Switch to a minimal fix according to Jonathan's comment.
- Link to v1: https://lore.kernel.org/r/20260426-meson_saradc-v1-1-6e96b2982c43@gmail.com
---
 drivers/iio/adc/meson_saradc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index 23991a3612bd..000e39ca5c62 100644
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -817,9 +817,11 @@ static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev)
 	}
 
 	priv->tsc_regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "amlogic,hhi-sysctrl");
-	if (IS_ERR(priv->tsc_regmap))
+	if (IS_ERR(priv->tsc_regmap)) {
+		kfree(buf);
 		return dev_err_probe(dev, PTR_ERR(priv->tsc_regmap),
 				     "failed to get amlogic,hhi-sysctrl regmap\n");
+	}
 
 	trimming_bits = priv->param->temperature_trimming_bits;
 	trimming_mask = BIT(trimming_bits) - 1;

---
base-commit: 7080e32d3f09d8688c4a87d81bdcc71f7f606b16
change-id: 20260425-meson_saradc-54abc52d9b31

Best regards,
-- 
Felix Gu <ustc.gu@gmail.com>