hw/intc/loongson_ipi: Fix resource leak

Once initialised, QOM objects can be realized and
unrealized multiple times before being finalized.
Resources allocated in REALIZE must be deallocated
in an equivalent UNREALIZE handler.

Free the CPU array in loongson_ipi_unrealize()
instead of loongson_ipi_finalize().

Cc: qemu-stable@nongnu.org
Fixes: 5e90b8db382 ("hw/loongarch: Set iocsr address space per-board rather than percpu")
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Song Gao <gaosong@loongson.cn>
Message-Id: <20240723111405.14208-3-philmd@linaro.org>

hw/intc/loongson_ipi.c

@@ -318,6 +318,13 @@ static void loongson_ipi_realize(DeviceState *dev, Error **errp)
     }
 }
 
+static void loongson_ipi_unrealize(DeviceState *dev)
+{
+    LoongsonIPI *s = LOONGSON_IPI(dev);
+
+    g_free(s->cpu);
+}
+
 static const VMStateDescription vmstate_ipi_core = {
     .name = "ipi-single",
     .version_id = 2,
@@ -353,23 +360,16 @@ static void loongson_ipi_class_init(ObjectClass *klass, void *data)
     DeviceClass *dc = DEVICE_CLASS(klass);
 
     dc->realize = loongson_ipi_realize;
+    dc->unrealize = loongson_ipi_unrealize;
     device_class_set_props(dc, ipi_properties);
     dc->vmsd = &vmstate_loongson_ipi;
 }
 
-static void loongson_ipi_finalize(Object *obj)
-{
-    LoongsonIPI *s = LOONGSON_IPI(obj);
-
-    g_free(s->cpu);
-}
-
 static const TypeInfo loongson_ipi_info = {
     .name          = TYPE_LOONGSON_IPI,
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(LoongsonIPI),
     .class_init    = loongson_ipi_class_init,
-    .instance_finalize = loongson_ipi_finalize,
 };
 
 static void loongson_ipi_register_types(void)