btrfs: switch types to int when counting eb pages
The loops iterating eb pages use unsigned long, that's an overkill as we know that there are at most 16 pages (64k / 4k), and 4 by default (with nodesize 16k). Reviewed-by: Nikolay Borisov <nborisov@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
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