of_net: fix of_get_mac_address retval if compiled without CONFIG_OF
of_get_mac_address prior to commit d01f449c ("of_net: add NVMEM support to of_get_mac_address") could return only valid pointer or NULL, after this change it could return only valid pointer or ERR_PTR encoded error value, but I've forget to change the return value of of_get_mac_address in case where the kernel is compiled without CONFIG_OF, so I'm doing so now. Cc: Mirko Lindner <mlindner@marvell.com> Cc: Stephen Hemminger <stephen@networkplumber.org> Fixes: d01f449c ("of_net: add NVMEM support to of_get_mac_address") Reported-by: Octavio Alvarez <octallk1@alvarezp.org> Signed-off-by: Petr Štetiar <ynezz@true.cz> Signed-off-by: David S. Miller <davem@davemloft.net>
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