The old code considered valid empty LZMA2 streams to be corrupt.
Note that a typical empty .xz file has no LZMA2 data at all,
and thus most .xz files having no uncompressed data are handled
correctly even without this fix.
Signed-off-by: NLasse Collin <lasse.collin@tukaani.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>