erofs-utils: use chunk-based data deduplication if compression is off

After this patch, "-E dedupe" can now support chunk-based data
deduplication with block-sized chunks if compression is off.

Link: https://lore.kernel.org/r/20221017031736.90542-1-hsiangkao@linux.alibaba.com
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
1 file changed