xfs: cleanup error handling in xfs_swap_extents
Use multiple lables for proper error unwinding and get rid of some now superflous variables. Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net> Signed-off-by: Christoph Hellwig <hch@lst.de> Tested-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Felix Blyakher <felixb@sgi.com>
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