net: axienet: add missing error return code in axienet_probe()

It should return error code in error path in axienet_probe().

Fixes: 00be43a7 ("net: axienet: make the 64b addresable DMA depends on 64b archectures")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220616062917.3601-1-yangyingliang@huawei.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>