net: of_mdio: don't store the length of a property if we don't need to
of_get_property() can be called with NULL as 2nd argument if the caller is not interested in the length of a property. Use that here so we can get rid of a variable. Signed-off-by: NDaniel Mack <zonque@gmail.com> Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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