The iommu_paging_domain_alloc() function doesn't return NULL pointers,
it returns error pointers. Update the check to match.
Fixes: 45c690aea8ee ("drm/tegra: Use iommu_paging_domain_alloc()")
Signed-off-by: Dan Carpenter<dan.carpenter@xxxxxxxxxx>
---
drivers/gpu/drm/tegra/drm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)