hw/misc/riscv_cpc: Free CPU array in instance_finalize

The TYPE_RISCV_CPC device allocates an array in its instance_init,
but does not free this, leading to leaks like this from QOM/QMP
introspection:

Direct leak of 512 byte in 1 object allocated from:
    #0  in calloc
    #1  in g_malloc0
    #2  in riscv_cpc_init /home/pm215/qemu/build/san/../../hw/misc/riscv_cpc.c:175:15
    #3  in object_initialize_with_type /home/pm215/qemu/build/san/../../qom/object.c:570:5
    #4  in object_new_with_type /home/pm215/qemu/build/san/../../qom/object.c:774:5
    #5  in qmp_device_list_properties /home/pm215/qemu/build/san/../../qom/qom-qmp-cmds.c:206:11
    #6  in qdev_device_help /home/pm215/qemu/build/san/../../system/qdev-monitor.c:313:17
    #7  in hmp_device_add /home/pm215/qemu/build/san/../../system/qdev-monitor.c:1005:9

Free the array in instance_finalize.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20260309095328.1406779-1-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>

hw/misc/riscv_cpc.c

@@ -185,6 +185,13 @@ static void riscv_cpc_init(Object *obj)
     }
 }
 
+static void riscv_cpc_finalize(Object *obj)
+{
+    RISCVCPCState *s = RISCV_CPC(obj);
+
+    g_free(s->cpus);
+}
+
 static void riscv_cpc_realize(DeviceState *dev, Error **errp)
 {
     RISCVCPCState *s = RISCV_CPC(dev);
@@ -254,6 +261,7 @@ static const TypeInfo riscv_cpc_info = {
     .parent        = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(RISCVCPCState),
     .instance_init = riscv_cpc_init,
+    .instance_finalize = riscv_cpc_finalize,
     .class_init    = riscv_cpc_class_init,
 };