rng-egd: Register "chardev" as class property

Class properties make QOM introspection simpler and easier, as
they don't require an object to be instantiated.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20200921221045.699690-4-ehabkost@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
diff --git a/backends/rng-egd.c b/backends/rng-egd.c
index 20198ff..4de142b 100644
--- a/backends/rng-egd.c
+++ b/backends/rng-egd.c
@@ -135,12 +135,6 @@
     return NULL;
 }
 
-static void rng_egd_init(Object *obj)
-{
-    object_property_add_str(obj, "chardev",
-                            rng_egd_get_chardev, rng_egd_set_chardev);
-}
-
 static void rng_egd_finalize(Object *obj)
 {
     RngEgd *s = RNG_EGD(obj);
@@ -155,6 +149,8 @@
 
     rbc->request_entropy = rng_egd_request_entropy;
     rbc->opened = rng_egd_opened;
+    object_class_property_add_str(klass, "chardev",
+                                  rng_egd_get_chardev, rng_egd_set_chardev);
 }
 
 static const TypeInfo rng_egd_info = {
@@ -162,7 +158,6 @@
     .parent = TYPE_RNG_BACKEND,
     .instance_size = sizeof(RngEgd),
     .class_init = rng_egd_class_init,
-    .instance_init = rng_egd_init,
     .instance_finalize = rng_egd_finalize,
 };