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committer Phillip Lougher <phillip@squashfs.org.uk> 1331348460 +0000

Squashfs: update comment removing reference to zlib only

Comment was written when Squashfs only supported zlib compression.
This comment is now misleading given Squashfs supports other
compression algorithms.

Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk>