[PATCH -next] iommu/ipmmu-vmsa: Fix return value check in ipmmu_find_group_dma()

[Wei Yongjun]

In case of error, the function iommu_group_get() returns NULL pointer
not ERR_PTR(). The IS_ERR() test in the return value check should be
replaced with NULL test.

Fixes: 3ae47292024f ("iommu/ipmmu-vmsa: Add new IOMMU_DOMAIN_DMA ops")
Signed-off-by: Wei Yongjun <weiyongjun1@xxxxxxxxxx>
---
 drivers/iommu/ipmmu-vmsa.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index af81400..00e88a8 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -871,7 +871,7 @@ static struct iommu_group *ipmmu_find_group_dma(struct device *dev)
 	sibling = ipmmu_find_sibling_device(dev);
 	if (sibling)
 		group = iommu_group_get(sibling);
-	if (!sibling || IS_ERR(group))
+	if (!sibling || !group)
 		group = generic_device_group(dev);
 
 	return group;