The PHYLIB mdio code has more problems in error paths:
- mdiobus_release can be called before bus->state is set to
  MDIOBUS_REGISTERED
- mdiobus_scan allocates resources which need to be freed
- the comment is wrong, the resistors used are actually pull-ups.
Signed-off-by: NKrzysztof Halasa <khc@pm.waw.pl>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>