iio: core: Get rid of misleading comment

This comment did not fit here.  It explains why devm_kmalloc
uses dr_alloc.  Generally is not needed at all.
Signed-off-by: NKarol Wrona <k.wrona@samsung.com>
Signed-off-by: NJonathan Cameron <jic23@kernel.org>

drivers/iio/industrialio-core.c

@@ -1043,7 +1043,6 @@ struct iio_dev *devm_iio_device_alloc(struct device *dev, int sizeof_priv)
 	if (!ptr)
 		return NULL;
 
-	/* use raw alloc_dr for kmalloc caller tracing */
 	iio_dev = iio_device_alloc(sizeof_priv);
 	if (iio_dev) {
 		*ptr = iio_dev;