net: bcmgenet: fix error returns in bcmgenet_probe()

net: bcmgenet: fix error returns in bcmgenet_probe()

[ Upstream commit 24a63fe6d45d6527db5ab87bcd1da6921f10e89e ]

The driver forgets to call clk_disable_unprepare() in error path after
a success calling for clk_prepare_enable().

Fix to goto err_clk_disable if clk_prepare_enable() is successful.

Fixes: 99d55638d4b0 ("net: bcmgenet: enable NETIF_F_HIGHDMA flag")
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Acked-by: Doug Berger <opendmb@gmail.com>
Acked-by: Florian fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>