video_output: fix disabled log compilation

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

src/video_output/video_output.c

@@ -1090,7 +1090,7 @@ static int ThreadDisplayRenderPicture(vout_thread_t *vout, bool is_forced)
 
     /* Wait the real date (for rendering jitter) */
 #if 0
-    mtime_t delay = direct->date - mdate();
+    mtime_t delay = todisplay->date - mdate();
     if (delay < 1000)
         msg_Warn(vout, "picture is late (%lld ms)", delay / 1000);
 #endif