of: overlay: Fix trivial typo

Permitted is spelled with two t.

Signed-off-by: Ricardo Ribalda <[e-mail]>
Reviewed-by: Philippe Mathieu-Daudé <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

drivers/of/overlay.c

···
  * The topmost check is done by exploiting this property. For each
  * affected device node in the log list we check if this overlay is
  * the one closest to the tail. If another overlay has affected this
- * device node and is closest to the tail, then removal is not permited.
+ * device node and is closest to the tail, then removal is not permitted.
  */
 static int overlay_removal_is_ok(struct overlay_changeset *remove_ovcs)
 {