src: remove unused variable in node_native_module.cc

PR-URL: nodejs#26411
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

src/node_native_module.cc

@@ -191,7 +191,6 @@ MaybeLocal<Function> NativeModuleLoader::LookupAndCompile(
     Environment* optional_env) {
   Isolate* isolate = context->GetIsolate();
   EscapableHandleScope scope(isolate);
-  Local<Value> ret;  // Used to convert to MaybeLocal before return
 
   const auto source_it = source_.find(id);
   CHECK_NE(source_it, source_.end());