Fix LocaleRosterData::CompareInfos.

* The given void pointers are pointers to the actual list items, which
  are pointers themselves, so there was an indirection missing
* Fix inverted sort order

This could have caused spurious crashes related to initialization of
the locale kit, most notably this was responsible for triggering a
crashing bug in the plaintext add-on that caused the x86 image
not being able to boot.
I will continue with trying to find the actual crash, too.