net: macb: support of_get_mac_address new ERR_PTR error
There was NVMEM support added directly to of_get_mac_address, and it uses nvmem_get_mac_address under the hood, so we can remove it. As of_get_mac_address can now return ERR_PTR encoded error values, adjust to that as well. Signed-off-by: Petr Štetiar <ynezz@true.cz> Signed-off-by: David S. Miller <davem@davemloft.net>
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