net: fec: Only unregister MII bus if we registered it
If we fail to probe for whatever reason, we cannot unregister/free the
MII bus unless we registered it with fec_get_miibus. This fixes FECs
sharing an MDIO bus from destroying it, preventing the other FEC from
using it.
Fixes: 6a895d039b ("net: Update eQos driver and FEC driver to use eth phy interfaces") Signed-off-by: Sean Anderson <sean.anderson@seco.com> Reviewed-by: Ramon Fried <rfried.dev@gmail.com>