xfs: remove the unused XFS_QMOPT_DQLOCK flag
The XFS_QMOPT_DQLOCK flag introduces major complexity in the quota subsystem but isn't actually used anywhere. So remove it and all the hazzles it introduces. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NFelix Blyakher <felixb@sgi.com>
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