lib/scatterlist: Add SG_CHAIN and SG_END macros for LSB encodings
This replaces scatterlist->page_link LSB encodings with SG_CHAIN and SG_END definitions without any functional change. Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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