Btrfs: fix a regression in balance usage filter
Commit 3fed40cc ("Btrfs: cleanup duplicated division functions"), which was merged into 3.8-rc1, has introduced a regression by removing logic that was guarding us against bad user input. Bring it back. Signed-off-by: NIlya Dryomov <idryomov@gmail.com> Signed-off-by: NChris Mason <chris.mason@fusionio.com>
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