Fail server initialization if secure credentials cannot be obtained.

The server will now return nullptr and log an error if it fails to get secure credentials, instead of falling back to using an insecure server.

PiperOrigin-RevId: 927502688
Change-Id: I4525df0f6051c97dcd892da67595bf397d355586

server/strowgerd_server.cpp

diff --git a/server/strowgerd_server.cpp b/server/strowgerd_server.cpp
index 5cba93d..1cc9462 100644
--- a/server/strowgerd_server.cpp
+++ b/server/strowgerd_server.cpp
@@ -133,8 +133,8 @@
         return nullptr;
       }
     } else {
-      LOG(WARNING)
-          << "Failed to get secure credentials. Using insecure server.";
+      LOG(ERROR) << "Failed to get secure credentials.";
+      return nullptr;
     }
   }