Currently if you load redis-sentinel without a config file, it tells you to use redis-server instead. This fixes the warning.
Took a suggestion from @pietern to use argv - this was initially to avoid checking redis.sentinel_mode, but I like this compromise because it provides both the exact string used to start the binary + the right name of the conf file.
Fix warning in redis.c for sentinel config load
@antirez Updated with your suggestion
Thank you, merged.