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87c956d4c4
The suffix refactor done in 99575947a58a60416c570eb78038d18a1ea4cef4
had a small regression where raw format compression to standard out
failed if a suffix was not set. In this case, setting the suffix did
not make sense since a file is not created.
Now, xz should only fail when a suffix is not provided when it is
actually needed.
For instance:
echo "foo" | xz --format=raw --lzma2 | wc -c
does not need a suffix check since it creates no files. But:
xz --format=raw --lzma2 --suffix=.bar foo
Needs the suffix to be set since it must create foo.bar.