Fix uninitialized variables in alone_decoder.c. This bug was triggered by the previous commit, since these variables were not used by anything before support for a preset dictionary.
Fix uninitialized variables in alone_decoder.c. This bug was
triggered by the previous commit, since these variables were
not used by anything before support for a preset dictionary.

pombreda/go-liblzma,pombreda/go-liblzma,pombreda/go-liblzma