eldbus_test_eldbus_message: Fix resource leak

Summary:
Coverity reports that we leak the variable 'msg' going out of scope
here, so lets add a call to unref the returned eldbus_message so it
gets freed

Fixes CID1400921

@fix
Depends on D8772

Reviewers: raster, cedric, zmike, bu5hm4n, segfaultxavi

Reviewed By: segfaultxavi

Subscribers: segfaultxavi, #reviewers, #committers

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D8773

src/tests/eldbus/eldbus_test_eldbus_message.c

@@ -1455,6 +1455,7 @@ EFL_START_TEST(utc_eldbus_message_iter_del_p)
         eldbus_message_iter_del(iter);
      }
 
+   eldbus_message_unref(msg);
    eldbus_connection_unref(conn_client);
    eldbus_service_interface_unregister(iface);
    eldbus_connection_unref(conn_server);