fix(core): initialize plugin common tag size

src/base/neu_plugin_common.c

@@ -30,6 +30,7 @@ void neu_plugin_common_init(neu_plugin_common_t *common)
 {
     common->magic      = NEU_PLUGIN_MAGIC_NUMBER;
     common->link_state = NEU_NODE_LINK_STATUS_DISCONNECTED;
+    common->tag_size   = 0;
 }
 
 bool neu_plugin_common_check(neu_plugin_t *plugin)
@@ -45,4 +46,4 @@ int neu_plugin_op(neu_plugin_t *plugin, neu_reqresp_head_t head, void *data)
 
     return plugin_common->adapter_callbacks->command(plugin_common->adapter,
                                                      head, data);
-}
+}