f2fs: simplify the way of calulating next nat address
The index of segment which the next nat block is in has only one different bit than the current one, so to get the next nat address, we can simply alter that one bit. Signed-off-by: NFan Li <fanofcode.li@samsung.com> Reviewed-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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