iio: adc: Use devm_krealloc_array

Now that it exists, use it instead of doing the multiplication and
checking for overflow manually.

Reviewed-by: Jonathan Cameron <[e-mail]>
Signed-off-by: James Clark <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/iio/adc/xilinx-ams.c

···
 	struct device *dev = indio_dev->dev.parent;
 	struct fwnode_handle *child = NULL;
 	struct fwnode_handle *fwnode = dev_fwnode(dev);
-	size_t ams_size, dev_size;
+	size_t ams_size;
 	int ret, ch_cnt = 0, i, rising_off, falling_off;
 	unsigned int num_channels = 0;
 
···
 		}
 	}
 
-	dev_size = array_size(sizeof(*dev_channels), num_channels);
-	if (dev_size == SIZE_MAX)
-		return -ENOMEM;
-
-	dev_channels = devm_krealloc(dev, ams_channels, dev_size, GFP_KERNEL);
+	dev_channels = devm_krealloc_array(dev, ams_channels, num_channels,
+					   sizeof(*dev_channels), GFP_KERNEL);
 	if (!dev_channels)
 		return -ENOMEM;
 

drivers/iio/adc/xilinx-xadc-core.c

···
 	const unsigned long *mask)
 {
 	struct xadc *xadc = iio_priv(indio_dev);
-	size_t new_size, n;
+	size_t n;
 	void *data;
 
 	n = bitmap_weight(mask, indio_dev->masklength);
 
-	if (check_mul_overflow(n, sizeof(*xadc->data), &new_size))
-		return -ENOMEM;
-
-	data = devm_krealloc(indio_dev->dev.parent, xadc->data,
-			     new_size, GFP_KERNEL);
+	data = devm_krealloc_array(indio_dev->dev.parent, xadc->data,
+				   n, sizeof(*xadc->data), GFP_KERNEL);
 	if (!data)
 		return -ENOMEM;
 
-	memset(data, 0, new_size);
+	memset(data, 0, n * sizeof(*xadc->data));
 	xadc->data = data;
 
 	return 0;
···
 	}
 
 	indio_dev->num_channels = num_channels;
-	indio_dev->channels = devm_krealloc(dev, channels,
-					    sizeof(*channels) * num_channels,
-					    GFP_KERNEL);
+	indio_dev->channels = devm_krealloc_array(dev, channels,
+						  num_channels, sizeof(*channels),
+						  GFP_KERNEL);
 	/* If we can't resize the channels array, just use the original */
 	if (!indio_dev->channels)
 		indio_dev->channels = channels;