of: address.c header comment typo

Fix typo in header comment for of_address_to_resource()

Signed-off-by: Frank Rowand <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>

drivers/of/address.c

···
  *
  * Note that if your address is a PIO address, the conversion will fail if
  * the physical address can't be internally converted to an IO token with
- * pci_address_to_pio(), that is because it's either called to early or it
+ * pci_address_to_pio(), that is because it's either called too early or it
  * can't be matched to any host bridge IO space
  */
 int of_address_to_resource(struct device_node *dev, int index,