drm/nouveau/tegra: Fix error handling
'iommu_domain_alloc()' returns NULL in case of error, not an error pointer. So test it accordingly. Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr> Reviewed-by: NAlexandre Courbot <acourbot@nvidia.com> Signed-off-by: NBen Skeggs <bskeggs@redhat.com>
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