Fix to return error code -ENOMEM from the aq_ndev_alloc() error
handling case instead of 0, as done elsewhere in this function.

Fixes: 23ee07ad ("net: aquantia: Cleanup pci functions module")
Signed-off-by: NWei Yongjun <weiyongjun1@huawei.com>
Acked-by: NIgor Russkikh <igor.russkikh@aquantia.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>