drm/tegra: Fix a strange error handling path

drm/tegra: Fix a strange error handling path

The resource freed at the 'put_aux' label is "sor->aux->dev".
However, this resource is taken after devm_tegra_pmc_get(), so there is no
point to release it in this error handling path.

This is harmless because put_device() will be called with a NULL pointer,
but this is confusing.

So, fix the logic and return directly.

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Thierry Reding <treding@nvidia.com>