Eo: fix error handling when too many deletions invocations occur.

Before this fix, when a deletion was invoked twice on an object, a
wrong message ("...You wrongly call eo_unref() within a destructor...")
was printed. This was caused by the del_triggered flag that was not
resetted when the destruction finished.

This patch fixes this behavior by printing the right message on a double
deletion.

src/lib/eo/eo_private.h

@@ -279,21 +279,22 @@ _eo_unref(_Eo_Object *obj)
    --(obj->refcount);
    if (obj->refcount == 0)
      {
+        if (obj->destructed)
+          {
+             ERR("Object %p already destructed.", _eo_id_get(obj));
+             return;
+          }
+
         if (obj->del_triggered)
           {
-             ERR("Object %p deletion already triggered. You wrongly call eo_unref() within a destructor.", obj);
+             ERR("Object %p deletion already triggered. You wrongly call eo_unref() within a destructor.", _eo_id_get(obj));
              return;
           }
         obj->del_triggered = EINA_TRUE;
 
-        if (obj->destructed)
-          {
-             ERR("Object %p already destructed.", obj);
-             return;
-          }
-
         _eo_del_internal(__FILE__, __LINE__, obj);
 
+        obj->del_triggered = EINA_FALSE;
 #ifdef EO_DEBUG
         /* If for some reason it's not empty, clear it. */
         while (obj->xrefs)

src/tests/eo/suite/eo_test_class_behaviour_errors.c

@@ -57,7 +57,41 @@ START_TEST(eo_destructor_unref)
 }
 END_TEST
 
+START_TEST(eo_destructor_double_del)
+{
+   eo_init();
+   eina_log_print_cb_set(eo_test_print_cb, &ctx);
+
+   static Eo_Class_Description class_desc = {
+        EO_VERSION,
+        "Simple",
+        EO_CLASS_TYPE_REGULAR,
+        EO_CLASS_DESCRIPTION_NOOPS(),
+        NULL,
+        0,
+        NULL,
+        NULL
+   };
+
+   klass = eo_class_new(&class_desc, SIMPLE_CLASS, NULL);
+   fail_if(!klass);
+
+   Eo *obj = eo_add(klass, NULL);
+   eo_manual_free_set(obj, EINA_TRUE);
+   fail_if(!obj);
+
+   TEST_EO_ERROR("_eo_unref", "Object %p already destructed.");
+   eo_del(obj);
+   eo_del(obj);
+
+   eina_log_print_cb_set(eina_log_print_cb_stderr, NULL);
+
+   eo_shutdown();
+}
+END_TEST
+
 void eo_test_class_behaviour_errors(TCase *tc)
 {
    tcase_add_test(tc, eo_destructor_unref);
+   tcase_add_test(tc, eo_destructor_double_del);
 }