iio: light: st_uvis25: Use iio_push_to_buffers_with_ts() to allow source size runtime check

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/st_uvis25.h

···
 	struct iio_trigger *trig;
 	bool enabled;
 	int irq;
-	/* Ensure timestamp is naturally aligned */
-	struct {
-		u8 chan;
-		aligned_s64 ts;
-	} scan;
 };
 
 extern const struct dev_pm_ops st_uvis25_pm_ops;

drivers/iio/light/st_uvis25_core.c

···
 	struct st_uvis25_hw *hw = iio_priv(iio_dev);
 	unsigned int val;
 	int err;
+	/* Ensure timestamp is naturally aligned */
+	struct {
+		u8 chan;
+		aligned_s64 ts;
+	} scan = { };
+
 
 	err = regmap_read(hw->regmap, ST_UVIS25_REG_OUT_ADDR, &val);
 	if (err < 0)
 		goto out;
 
-	hw->scan.chan = val;
+	scan.chan = val;
 
-	iio_push_to_buffers_with_timestamp(iio_dev, &hw->scan,
-					   iio_get_time_ns(iio_dev));
+	iio_push_to_buffers_with_ts(iio_dev, &scan, sizeof(scan),
+				    iio_get_time_ns(iio_dev));
 
 out:
 	iio_trigger_notify_done(hw->trig);