Miniview: Fix crash due to miniview render after deletion

_deferred_renderer() could be called after object del because the
timer was renewed even though it was invalid (marked as NULL).

src/bin/miniview.c

@@ -351,7 +351,7 @@ _deferred_renderer(void *data)
    if ((!mv) || (!mv->is_shown) || (!mv->to_render) || (mv->img_h == 0))
      {
         mv->deferred_renderer = NULL;
-        return EINA_TRUE;
+        return EINA_FALSE;
      }
 
    miniview_colors_get(mv, colors);