plugin_manager: fix missing return error

Refs #35083

Change-Id: I8de2439090a36a4aae8451c897d8168dc19cdf65

daemon/src/plugin_manager.h

@@ -58,7 +58,7 @@ public:
     static int32_t registerObject(const SFLPluginAPI* api,
                                   const int8_t* type,
                                   const SFLPluginRegisterParams* params) {
-        static_cast<PluginManager*>(api->context)->registerObject_(type, params);
+        return static_cast<PluginManager*>(api->context)->registerObject_(type, params);
     }
 
     int load(const std::string& path);