dummy vout: check for sys->pool before deleting it.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

modules/misc/dummy/vout.c

@@ -91,6 +91,7 @@ void CloseVideo(vlc_object_t *object)
     vout_display_t *vd = (vout_display_t *)object;
     vout_display_sys_t *sys = vd->sys;
 
+    if (sys->pool)
         picture_pool_Delete(sys->pool);
     free(sys);
 }