net: phy: air_en8811h: fix some error codes

These error paths accidentally return "ret" which is zero/success
instead of the correct error code.

Fixes: 71e79430 ("net: phy: air_en8811h: Add the Airoha EN8811H PHY driver")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/7ef2e230-dfb7-4a77-8973-9e5be1a99fc2@moroto.mountain


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