qom: fix leak for objects created with -object

The object must be unref-ed when its variable goes out of scope.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

vl.c

diff --git a/vl.c b/vl.c
index 0f67545..2170a5e 100644
--- a/vl.c
+++ b/vl.c
@@ -2810,12 +2810,13 @@
 
     obj = object_new(type);
     if (qemu_opt_foreach(opts, object_set_property, obj, 1) < 0) {
+        object_unref(obj);
         return -1;
     }
 
     object_property_add_child(container_get(object_get_root(), "/objects"),
                               id, obj, NULL);
-
+    object_unref(obj);
     return 0;
 }