of/platform: fix of_platform_device_destroy comment

Update the comment to of_platform_device_destroy() to reflect that it no
longer returns a status value.

Fixes: 75f353b61342 ("of/platform: Fix of_platform_device_destroy...")
Signed-off-by: Johan Hovold <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

drivers/of/platform.c

···
  * of the given device (and, recurrently, their children) that have been
  * created from their respective device tree nodes (and only those,
  * leaving others - eg. manually created - unharmed).
- *
- * Returns 0 when all children devices have been removed or
- * -EBUSY when some children remained.
  */
 void of_platform_depopulate(struct device *parent)
 {