sparc: Check dev->realized at sparc_set_nwindows()

sparc_set_nwindows() is one of the very few property setters that
don't check dev->realized, and there's no reason for it to be
special.  Check dev->realized like the other setters.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20201211220529.2290218-6-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>

target/sparc/cpu.c

@@ -798,11 +798,17 @@ static void sparc_get_nwindows(Object *obj, Visitor *v, const char *name,
 static void sparc_set_nwindows(Object *obj, Visitor *v, const char *name,
                                void *opaque, Error **errp)
 {
+    DeviceState *dev = DEVICE(obj);
     const int64_t min = MIN_NWINDOWS;
     const int64_t max = MAX_NWINDOWS;
     SPARCCPU *cpu = SPARC_CPU(obj);
     int64_t value;
 
+    if (dev->realized) {
+        qdev_prop_set_after_realize(dev, name, errp);
+        return;
+    }
+
     if (!visit_type_int(v, name, &value, errp)) {
         return;
     }