src: fix -Wunreachable-code in src/node_api.cc

PR-URL: #58901 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Chengzhong Wu <legendecas@gmail.com> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: Vladimir Morozov <vmorozov@microsoft.com>

Author: codebytere

src/node_api.cc

@@ -1046,8 +1046,7 @@ napi_create_external_buffer(napi_env env,
 
 #if defined(V8_ENABLE_SANDBOX)
  return napi_set_last_error(env, napi_no_external_buffers_allowed);
-#endif
-
+#else
  v8::Isolate* isolate = env->isolate;
 
  // The finalizer object will delete itself after invoking the callback.
@@ -1069,6 +1068,7 @@ napi_create_external_buffer(napi_env env,
  // as it will be deleted when the buffer to which it is associated
  // is finalized.
  // coverity[leaked_storage]
+#endif // V8_ENABLE_SANDBOX
 }
 
 napi_status NAPI_CDECL napi_create_buffer_copy(napi_env env,