fix: server

Author: vansangpfiev

cortex-cpp/controllers/server.cc

@@ -184,7 +184,7 @@ void server::LoadModel(const HttpRequestPtr& req,
       (*(req->getJsonObject())).get("engine", kLlamaEngine).asString();
 
   // We have not loaded engine yet, should load it before using it
-  if (engines_.find(engine_type) != engines_.end()) {
+  if (engines_.find(engine_type) == engines_.end()) {
     auto get_engine_path = [](std::string_view e) {
       if (e == kLlamaEngine) {
         return kLlamaLibPath;