iio: light: isl29125: Use iio_push_to_buffers_with_ts() to allow source size runtime check

Also move the structure used as the source to the stack as it is only 16
bytes and not the target of an DMA or similar.

Reviewed-by: Matti Vaittinen <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/light/isl29125.c

···
 struct isl29125_data {
 	struct i2c_client *client;
 	u8 conf1;
-	/* Ensure timestamp is naturally aligned */
-	struct {
-		u16 chans[3];
-		aligned_s64 timestamp;
-	} scan;
 };
 
 #define ISL29125_CHANNEL(_color, _si) { \
···
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct isl29125_data *data = iio_priv(indio_dev);
 	int i, j = 0;
+	/* Ensure timestamp is naturally aligned */
+	struct {
+		u16 chans[3];
+		aligned_s64 timestamp;
+	} scan = { };
 
 	iio_for_each_active_channel(indio_dev, i) {
 		int ret = i2c_smbus_read_word_data(data->client,
···
 		if (ret < 0)
 			goto done;
 
-		data->scan.chans[j++] = ret;
+		scan.chans[j++] = ret;
 	}
 
-	iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
+	iio_push_to_buffers_with_ts(indio_dev, &scan, sizeof(scan),
 		iio_get_time_ns(indio_dev));
 
 done: