[PATCH v5 2/7] spapr.c: avoid sending MEM_UNPLUG_ERROR if dev->id is NULL

[Daniel Henrique Barboza <danielhb413@gmail.com>]

As done in hw/acpi/memory_hotplug.c, avoid sending
qapi_event_send_mem_unplug_error() if dev->id is NULL.

Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
---
 hw/ppc/spapr.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 81699d4f8b..1611d7ab05 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -3688,9 +3688,11 @@ void spapr_memory_unplug_rollback(SpaprMachineState *spapr, DeviceState *dev)
      * Tell QAPI that something happened and the memory
      * hotunplug wasn't successful.
      */
-    qapi_error = g_strdup_printf("Memory hotunplug rejected by the guest "
-                                 "for device %s", dev->id);
-    qapi_event_send_mem_unplug_error(dev->id, qapi_error);
+    if (dev->id) {
+        qapi_error = g_strdup_printf("Memory hotunplug rejected by the guest "
+                                     "for device %s", dev->id);
+        qapi_event_send_mem_unplug_error(dev->id, qapi_error);
+    }
 }
 
 /* Callback to be called during DRC release. */
-- 
2.31.1