[PATCH] vfio/pci: Fix null pointer deference from error API

[Jim Shu]

pci_dev_realize() use the local error variable, which requires
`error_setg()` API to allocate the error object at first.

Signed-off-by: Jim Shu <jim....@sifive.com>
---
 hw/vfio/pci.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c
index 0a99e55247..d994ad8bb9 100644
--- a/hw/vfio/pci.c
+++ b/hw/vfio/pci.c
@@ -3117,7 +3117,7 @@ static void vfio_realize(PCIDevice *pdev, Error **errp)
 
     if (!vbasedev->mdev &&
         !pci_device_set_iommu_device(pdev, vbasedev->hiod, errp)) {
-        error_prepend(errp, "Failed to set iommu_device: ");
+        error_setg(errp, "Failed to set iommu_device: ");
         goto out_teardown;
     }
 
-- 
2.17.1