ecore: properly cleanup variable on shutdown, so that cycling another init doesn't crash.

src/lib/ecore/ecore_main.c

@@ -1085,7 +1085,8 @@ _ecore_main_loop_shutdown(void)
    if (!ML_OBJ) return;
    _ecore_main_loop_clear(ML_OBJ, ML_DAT);
 // XXX: this seemingly closes fd's it shouldn't.... :( fd 0?
-   efl_unref(ML_OBJ);
+   efl_replace(&ML_OBJ, NULL);
+   ML_DAT = NULL;
 }
 
 void