xfs: fold xfs_attr_get_int into xfs_attr_get
This allows doing an unlocked check if an attr for is present at all and slightly reduce the lock hold time if we actually do an attr get. Plus various minor style fixes to the new xfs_attr_get. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NBrian Foster <bfoster@redhat.com> Reviewed-by: NDave Chinner <dchinner@redhat.com> Signed-off-by: NDave Chinner <david@fromorbit.com>
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