src/xvba_video_glx.c: Do not leak msg on displayed picture.

src/xvba_video_glx.c

@@ -247,10 +247,10 @@ static void *render_thread(void *arg)
                 msg->flags
             );
             glx_output_surface_unlock(obj_output);
-            free(msg);
             num_surfaces++;
             break;
         }
+        free(msg);
     }
 
     gl_destroy_context(obj_output->render_context);