nodedev: Fix missing network devices

Commit id '8708ca01' added a check to determine whether the NIC had
Switchdev capabilities; however, in doing so inadvertently would cause
network devices without a PCI device to not be added to the node device
database. Thus, network devices having a "computer" as a parent, such
as "net_lo*", "net_virbr*", "net_tun*", "net_vnet*", etc. were not added.

Alter the check to not even check for Switchdev bits if no PCI device found.

src/util/virnetdev.c

@@ -3236,6 +3236,14 @@ virNetDevSwitchdevFeature(const char *ifname,
     if (is_vf == 1 && virNetDevGetPhysicalFunction(ifname, &pfname) < 0)
         goto cleanup;
 
+    pci_device_ptr = pfname ? virNetDevGetPCIDevice(pfname) :
+                              virNetDevGetPCIDevice(ifname);
+    /* No PCI device, then no feature bit to check/add */
+    if (pci_device_ptr == NULL) {
+        ret = 0;
+        goto cleanup;
+    }
+
     if (!(nl_msg = nlmsg_alloc_simple(family_id,
                                       NLM_F_REQUEST | NLM_F_ACK))) {
         virReportOOMError();
@@ -3248,11 +3256,6 @@ virNetDevSwitchdevFeature(const char *ifname,
     gmsgh->cmd = DEVLINK_CMD_ESWITCH_GET;
     gmsgh->version = DEVLINK_GENL_VERSION;
 
-    pci_device_ptr = pfname ? virNetDevGetPCIDevice(pfname) :
-                              virNetDevGetPCIDevice(ifname);
-    if (pci_device_ptr == NULL)
-        goto cleanup;
-
     pci_name = virPCIDeviceGetName(pci_device_ptr);
 
     if (nla_put(nl_msg, DEVLINK_ATTR_BUS_NAME, strlen("pci")+1, "pci") < 0 ||