misc/mos6522: Use timer_free() in the finalize function to avoid memleak

When running device-introspect-test, a memory leak occurred in the mos6522_init
function, this patch use timer_free() in the finalize function to fix it.

ASAN shows memory leak stack:

Direct leak of 96 byte(s) in 2 object(s) allocated from:
    #0 0xfffd5fe9e1f0 in __interceptor_calloc (/lib64/libasan.so.5+0xee1f0)
    #1 0xfffd5f7b6800 in g_malloc0 (/lib64/libglib-2.0.so.0+0x56800)
    qemu#2 0xaaae50303d0c in timer_new_full qemu/include/qemu/timer.h:523
    qemu#3 0xaaae50303d0c in timer_new qemu/include/qemu/timer.h:544
    qemu#4 0xaaae50303d0c in timer_new_ns qemu/include/qemu/timer.h:562
    qemu#5 0xaaae50303d0c in mos6522_init qemu/hw/misc/mos6522.c:490
    qemu#6 0xaaae50b77d70 in object_init_with_type qemu/qom/object.c:371
    qemu#7 0xaaae50b7ae84 in object_initialize_with_type qemu/qom/object.c:515
    qemu#8 0xaaae50b7b0f8 in object_new_with_type qemu/qom/object.c:729
    qemu#9 0xaaae50bb6d58 in qmp_device_list_properties qemu/qom/qom-qmp-cmds.c:153
    qemu#10 0xaaae50d7e1dc in qmp_marshal_device_list_properties qemu/qapi/qapi-commands-qdev.c:59
    qemu#11 0xaaae50dc87a0 in do_qmp_dispatch_bh qemu/qapi/qmp-dispatch.c:110
    qemu#12 0xaaae50d931a0 in aio_bh_call qemu/util/async.c:136

Reported-by: Euler Robot <[email protected]>
Signed-off-by: Gan Qixin <[email protected]>
Acked-by: David Gibson <[email protected]>
Reviewed-by: Peter Maydell <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Laurent Vivier <[email protected]>

hw/misc/mos6522.c

@@ -490,6 +490,14 @@ static void mos6522_init(Object *obj)
     s->timers[1].timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, mos6522_timer2, s);
 }
 
+static void mos6522_finalize(Object *obj)
+{
+    MOS6522State *s = MOS6522(obj);
+
+    timer_free(s->timers[0].timer);
+    timer_free(s->timers[1].timer);
+}
+
 static Property mos6522_properties[] = {
     DEFINE_PROP_UINT64("frequency", MOS6522State, frequency, 0),
     DEFINE_PROP_END_OF_LIST()
@@ -519,6 +527,7 @@ static const TypeInfo mos6522_type_info = {
     .parent = TYPE_SYS_BUS_DEVICE,
     .instance_size = sizeof(MOS6522State),
     .instance_init = mos6522_init,
+    .instance_finalize = mos6522_finalize,
     .abstract = true,
     .class_size = sizeof(MOS6522DeviceClass),
     .class_init = mos6522_class_init,