drm/tegra: Fix NULL vs IS_ERR() check in probe()

JIRA: https://issues.redhat.com/browse/RHEL-78704
Upstream Status: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git

commit a85df8c
Author: Dan Carpenter <[email protected]>
Date:   Fri Sep 13 17:34:54 2024 +0300

    drm/tegra: Fix NULL vs IS_ERR() check in probe()

    The iommu_paging_domain_alloc() function doesn't  return NULL pointers,
    it returns error pointers.  Update the check to match.

    Fixes: 45c690a ("drm/tegra: Use iommu_paging_domain_alloc()")
    Signed-off-by: Dan Carpenter <[email protected]>
    Reviewed-by: Lu Baolu <[email protected]>
    Signed-off-by: Thierry Reding <[email protected]>
    Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

(cherry picked from commit a85df8c)
Signed-off-by: Jerry Snitselaar <[email protected]>

Author: snits

drivers/gpu/drm/tegra/drm.c

@@ -1152,8 +1152,8 @@ 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;
 		}