iio: accel: bma400: simplify with cleanup.h

Allocate the memory with scoped/cleanup.h to reduce error handling and
make the code a bit simpler.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20240705-cleanup-h-iio-v1-1-77114c7e84c5@linaro.orgSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/accel/bma400_core.c

@@ -13,6 +13,7 @@
 
 #include <linux/bitfield.h>
 #include <linux/bitops.h>
+#include <linux/cleanup.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -795,21 +796,19 @@ static int bma400_enable_steps(struct bma400_data *data, int val)
 
 static int bma400_get_steps_reg(struct bma400_data *data, int *val)
 {
-	u8 *steps_raw;
 	int ret;
 
-	steps_raw = kmalloc(BMA400_STEP_RAW_LEN, GFP_KERNEL);
+	u8 *steps_raw __free(kfree) = kmalloc(BMA400_STEP_RAW_LEN, GFP_KERNEL);
 	if (!steps_raw)
 		return -ENOMEM;
 
 	ret = regmap_bulk_read(data->regmap, BMA400_STEP_CNT0_REG,
 			       steps_raw, BMA400_STEP_RAW_LEN);
-	if (ret) {
-		kfree(steps_raw);
+	if (ret)
 		return ret;
-	}
+
 	*val = get_unaligned_le24(steps_raw);
-	kfree(steps_raw);
+
 	return IIO_VAL_INT;
 }