Replace virNodeDeviceFree with virObjectUnref

Since virNodeDeviceFree will call virObjectUnref anyway, let's just use that
directly so as to avoid the possibility that we inadvertently clear out
a pending error message when using the public API.

cfg.mk

@@ -992,7 +992,7 @@ sc_prohibit_system_error_with_vir_err:
 # functions. There's a corresponding exclude to allow usage within tests,
 # docs, examples, tools, src/libvirt-*.c, and include/libvirt/libvirt-*.h
 sc_prohibit_virXXXFree:
-	@prohibit='\bvir(Domain|Network)Free\b'	\
+	@prohibit='\bvir(Domain|Network|NodeDevice)Free\b'	\
 	exclude='sc_prohibit_virXXXFree' \
 	halt='avoid using 'virXXXFree', use 'virObjectUnref' instead' \
 	  $(_sc_search_regexp)
@@ -1186,4 +1186,4 @@ exclude_file_name_regexp--sc_prohibit_devname = \
   ^(tools/virsh.pod|cfg.mk|docs/.*)$$
 
 exclude_file_name_regexp--sc_prohibit_virXXXFree = \
-  ^(docs/|tests/|examples/|tools/|cfg.mk|src/libvirt_public.syms|include/libvirt/libvirt-(domain|network).h|src/libvirt-(domain|qemu|network).c$$)
+  ^(docs/|tests/|examples/|tools/|cfg.mk|src/libvirt_public.syms|include/libvirt/libvirt-(domain|network|nodedev).h|src/libvirt-(domain|qemu|network|nodedev).c$$)

daemon/remote.c

@@ -3375,8 +3375,7 @@ remoteDispatchNodeDeviceGetParent(virNetServerPtr server ATTRIBUTE_UNUSED,
  cleanup:
     if (rv < 0)
         virNetMessageSaveError(rerr);
-    if (dev)
-        virNodeDeviceFree(dev);
+    virObjectUnref(dev);
     return rv;
 }
 
@@ -4908,7 +4907,7 @@ remoteDispatchConnectListAllNodeDevices(virNetServerPtr server ATTRIBUTE_UNUSED,
         virNetMessageSaveError(rerr);
     if (devices && ndevices > 0) {
         for (i = 0; i < ndevices; i++)
-            virNodeDeviceFree(devices[i]);
+            virObjectUnref(devices[i]);
         VIR_FREE(devices);
     }
     return rv;

src/conf/node_device_conf.c

@@ -1825,10 +1825,8 @@ virNodeDeviceObjListExport(virConnectPtr conn,
 
  cleanup:
     if (tmp_devices) {
-        for (i = 0; i < ndevices; i++) {
-            if (tmp_devices[i])
-                virNodeDeviceFree(tmp_devices[i]);
-        }
+        for (i = 0; i < ndevices; i++)
+            virObjectUnref(tmp_devices[i]);
     }
 
     VIR_FREE(tmp_devices);

src/remote/remote_driver.c

@@ -3387,8 +3387,7 @@ remoteConnectListAllNodeDevices(virConnectPtr conn,
  cleanup:
     if (tmp_devices) {
         for (i = 0; i < ret.devices.devices_len; i++)
-            if (tmp_devices[i])
-                virNodeDeviceFree(tmp_devices[i]);
+            virObjectUnref(tmp_devices[i]);
         VIR_FREE(tmp_devices);
     }