[PATCH] tar: support the common file extensions .tlzma and .txz

[Lauri Kasanen]

> Thanks, it works well now. Didn't catch anything reading the last few
> commits.

I ran cppcheck on the affected files, and it found one possibly
uninitialized use:
[decompress_bunzip2.c:156]: (error) Uninitialized variable: runCnt

Also, seems the __KERNEL__ ifdefs in the unxz code could be removed?

- Lauri

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