Alexander Block 3954096d4b Btrfs: fix check for changed extent in is_extent_unchanged
The previous check was working fine, but this check should be
easier to read. Also, we could theoritically have some exotic
bugs with the previous checks.

Signed-off-by: Alexander Block <ablock84@googlemail.com>
2012-10-01 15:18:57 -04:00
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