btrfs: use PAGE_ALIGNED instead of open-coding it
When using a 'var & (PAGE_SIZE - 1)' construct one is checking for a page alignment and thus should use the PAGE_ALIGNED() macro instead of open-coding it. Convert all open-coded occurrences of PAGE_ALIGNED(). Reviewed-by: NNikolay Borisov <nborisov@suse.com> Signed-off-by: NJohannes Thumshirn <jthumshirn@suse.de> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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