IIO: adc: at91_adc.c Prefer kmalloc_array over kmalloc with multiply

So this patch swaps that use out for kmalloc_array instead.

Signed-off-by Nizam Haider <nijamh@cdac.in>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/adc/at91_adc.c

@@ -742,7 +742,7 @@ static int at91_adc_of_get_resolution(struct at91_adc_state *st,
 		return count;
 	}
 
-	resolutions = kmalloc(count * sizeof(*resolutions), GFP_KERNEL);
+	resolutions = kmalloc_array(count, sizeof(*resolutions), GFP_KERNEL);
 	if (!resolutions)
 		return -ENOMEM;