The ag71xx_mdio_probe() forgets to call clk_disable_unprepare() when
of_reset_control_get_exclusive() failed. Add the missed call to fix it.

Fixes: d51b6ce4 ("net: ethernet: add ag71xx driver")
Reported-by: NHulk Robot <hulkci@huawei.com>
Signed-off-by: NHuang Guobin <huangguobin4@huawei.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>