iio: health: afe4403: Use get_unaligned_be24()

This makes the driver code slightly easier to read.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/health/afe4403.c

@@ -23,6 +23,8 @@
 #include <linux/iio/triggered_buffer.h>
 #include <linux/iio/trigger_consumer.h>
 
+#include <asm/unaligned.h>
+
 #include "afe440x.h"
 
 #define AFE4403_DRIVER_NAME		"afe4403"
@@ -220,13 +222,11 @@ static int afe4403_read(struct afe4403_data *afe, unsigned int reg, u32 *val)
 	if (ret)
 		return ret;
 
-	ret = spi_write_then_read(afe->spi, &reg, 1, rx, 3);
+	ret = spi_write_then_read(afe->spi, &reg, 1, rx, sizeof(rx));
 	if (ret)
 		return ret;
 
-	*val = (rx[0] << 16) |
-		(rx[1] << 8) |
-		(rx[2]);
+	*val = get_unaligned_be24(&rx[0]);
 
 	/* Disable reading from the device */
 	tx[3] = AFE440X_CONTROL0_WRITE;
@@ -322,13 +322,11 @@ static irqreturn_t afe4403_trigger_handler(int irq, void *private)
 			 indio_dev->masklength) {
 		ret = spi_write_then_read(afe->spi,
 					  &afe4403_channel_values[bit], 1,
-					  rx, 3);
+					  rx, sizeof(rx));
 		if (ret)
 			goto err;
 
-		buffer[i++] = (rx[0] << 16) |
-				(rx[1] << 8) |
-				(rx[2]);
+		buffer[i++] = get_unaligned_be24(&rx[0]);
 	}
 
 	/* Disable reading from the device */