fix the bug of set_config_static doesn't take effect when reload

@@ -1011,6 +1011,8 @@ int SrsConfig::reload_conf(SrsConfig* conf)
         return ret;
     }
     
+    set_config_static();
+
     return ret;
 }
 
@@ -2095,6 +2097,10 @@ int SrsConfig::check_config()
 
 void SrsConfig::set_config_static()
 {
+	if(this != _srs_config){
+		return;
+	}
+
 	 SrsConfDirective* conf = root->get("speex2aac");
 	 if(conf){
 	 	if(conf->arg0() == "on"){