btrfs: use IS_ALIGNED() for assertion in btrfs_lookup_csums_range() for simplicity
btrfs_lookup_csums_range() uses ALIGN() to check if "start" and "end + 1" are aligned to "root->sectorsize". It's better to replace these with IS_ALIGNED() for simplicity. Signed-off-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com> Signed-off-by: Chris Mason <clm@fb.com>
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