Empty file/line when logging

[caguero]

Environment

• OS Version: Ubuntu 24.04 -->
• Source or binary build? Source using the gz-utils3 branch (aae0d8c)

Description

• Expected behavior: When logging a message:

logger.RawLogger().trace("trace\n");

we should see:

(2024-09-22 19:48:25.019) [trace] [main.cc:32] trace

• Actual behavior: Instead, we see:

(2024-09-22 20:28:20.394) [trace] [:] trace

Steps to reproduce

1. Compile the main.cc example under examples/log and run it.