conf: avoid use-after-free when processing include sequences

Ticket: #8465

src/conf-yaml-loader.c

@@ -387,6 +387,7 @@ static int ConfYamlParse(
             if (ConfYamlParse(parser, state == CONF_INCLUDE ? parent : node, 1, rlevel,
                         state == CONF_INCLUDE ? CONF_INCLUDE : 0) != 0)
                 goto fail;
+            if (state != CONF_INCLUDE)
                 node->is_seq = 1;
             state = CONF_KEY;
         }