log.c: Remove obsolete comment

The comment for setup_logging was obsolete. The function
log_message() is called, fprintf() isn't.
This isn't a problem because of the send_stored_logs() function.

src/log.c

@@ -258,9 +258,6 @@ static void send_stored_logs (void)
 /**
  * Initialize the logging subsystem, based on the configuration.
  * Returns 0 upon success, -1 upon failure.
- *
- * This function uses fprintf() instead of log_message(), since
- * the logging is not yet set up...
  */
 int setup_logging (void)
 {