Btrfs: section mismatch warnings

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Hello everybody,

compiling btrfs into the kernel results in section mismatch warnings. __exit
functions are called where they are not allowed to. The attached patch fixes
this for me. Not sure if it is correct though.

Signed-off-by: Christian Hesse <mail@earthworm.de>
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Regards,
Chris

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Signed-off-by: Chris Mason <chris.mason@oracle.com>