iommu_domain_alloc() returns NULL on error, it doesn't return error
pointers.
Fixes: 58fd9375c2c5 ('drm/nouveau/platform: probe IOMMU if present')
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/nouveau/nouveau_platform.c b/drivers/gpu/drm/nouveau/nouveau_platform.c
index 775277f..4fbd35d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_platform.c
+++ b/drivers/gpu/drm/nouveau/nouveau_platform.c
@@ -102,7 +102,7 @@ static void nouveau_platform_probe_iommu(struct device *dev,
if (iommu_present(&platform_bus_type)) {
gpu->iommu.domain = iommu_domain_alloc(&platform_bus_type);
- if (IS_ERR(gpu->iommu.domain))
+ if (!gpu->iommu.domain)
goto error;
/*
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