renderer: destroy cond/mutex

For completeness (there is no dynamic allocation on Linux).
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

src/vrend_renderer.c

@@ -3514,6 +3514,9 @@ static void vrend_free_sync_thread(void)
    pipe_condvar_signal(vrend_state.fence_cond);
    pipe_thread_wait(vrend_state.sync_thread);
    vrend_state.sync_thread = 0;
+
+   pipe_condvar_destroy(vrend_state.fence_cond);
+   pipe_mutex_destroy(vrend_state.fence_mutex);
 }
 
 static ssize_t
@@ -3633,6 +3636,8 @@ static void vrend_renderer_use_threaded_sync(void)
       close(vrend_state.eventfd);
       vrend_state.eventfd = -1;
       vrend_clicbs->destroy_gl_context(vrend_state.sync_context);
+      pipe_condvar_destroy(vrend_state.fence_cond);
+      pipe_mutex_destroy(vrend_state.fence_mutex);
    }
 }
 #else