[Account.cpp] explicitly destroy priv->splits

better than 35b6fb767d

libgnucash/engine/Account.cpp

@@ -1436,11 +1436,10 @@ xaccFreeAccount (Account *acc)
     priv->type = ACCT_TYPE_NONE;
     gnc_commodity_decrement_usage_count(priv->commodity);
     priv->commodity = nullptr;
-    priv->splits.clear();
-    priv->splits.shrink_to_fit();
 
     priv->balance_dirty = FALSE;
     priv->sort_dirty = FALSE;
+    priv->splits.~SplitsVec();
 
     /* qof_instance_release (&acc->inst); */
     g_object_unref(acc);