pcie_sriov: unregister_vfs(): fix error path

local_err must be NULL before calling object_property_set_bool(), so we
must clear it on each iteration. Let's also use more convenient
error_reportf_err().

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Message-Id: <20230925194040.68592-8-vsementsov@yandex-team.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/pci/pcie_sriov.c

@@ -196,19 +196,16 @@ static void register_vfs(PCIDevice *dev)
 
 static void unregister_vfs(PCIDevice *dev)
 {
-    Error *local_err = NULL;
     uint16_t num_vfs = dev->exp.sriov_pf.num_vfs;
     uint16_t i;
 
     trace_sriov_unregister_vfs(dev->name, PCI_SLOT(dev->devfn),
                                PCI_FUNC(dev->devfn), num_vfs);
     for (i = 0; i < num_vfs; i++) {
+        Error *err = NULL;
         PCIDevice *vf = dev->exp.sriov_pf.vf[i];
-        object_property_set_bool(OBJECT(vf), "realized", false, &local_err);
-        if (local_err) {
-            fprintf(stderr, "Failed to unplug: %s\n",
-                    error_get_pretty(local_err));
-            error_free(local_err);
+        if (!object_property_set_bool(OBJECT(vf), "realized", false, &err)) {
+            error_reportf_err(err, "Failed to unplug: ");
         }
         object_unparent(OBJECT(vf));
         object_unref(OBJECT(vf));