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: Karol Wrona <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/iio/industrialio-core.c

···
 	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;