XZ decompressor: Fix decoding of empty LZMA2 streams
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>
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