block: bd_start_claiming fix module refcount
bd_start_claiming has an unbalanced module_put introduced in 6b4517a7. Signed-off-by: NNick Piggin <npiggin@suse.de> Acked-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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