[PATCH next] drm/tegra: Fix NULL vs IS_ERR() check in probe()

[Dan Carpenter]

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.carpen...@linaro.org>
---
 drivers/gpu/drm/tegra/drm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
index c9eb329665ec..34d22ba210b0 100644
--- a/drivers/gpu/drm/tegra/drm.c
+++ b/drivers/gpu/drm/tegra/drm.c
@@ -1153,8 +1153,8 @@ static int host1x_drm_probe(struct host1x_device *dev)
 
        if (host1x_drm_wants_iommu(dev) && device_iommu_mapped(dma_dev)) {
                tegra->domain = iommu_paging_domain_alloc(dma_dev);
-               if (!tegra->domain) {
-                       err = -ENOMEM;
+               if (IS_ERR(tegra->domain)) {
+                       err = PTR_ERR(tegra->domain);
                        goto free;
                }
 
-- 
2.45.2