ddca_init()/ddca_init2() can fail in libddcutil 2.x, in casea user's (optional) ddcutil configuration file contains errors.If that happens, we should not attempt to call any further ddcutilAPI functions, as they will only fail anyway.
This was pointed out by Sanford Rockowitz, maintainer of ddcutil.
Bonus commit
daemon: Rename DDCutilDetector init_status variable to just status
We're calling it status everywhere else (i.e. in DDCutilDisplay)and no expressiveness is lost by this shortening.