xfs: remove the unused XLOG_UNMOUNT_REC_TYPE define

Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>

fs/xfs/xfs_log_priv.h

@@ -525,12 +525,6 @@ xlog_cil_force(struct xlog *log)
 	xlog_cil_force_lsn(log, log->l_cilp->xc_current_sequence);
 }
 
-/*
- * Unmount record type is used as a pseudo transaction type for the ticket.
- * It's value must be outside the range of XFS_TRANS_* values.
- */
-#define XLOG_UNMOUNT_REC_TYPE	(-1U)
-
 /*
  * Wrapper function for waiting on a wait queue serialised against wakeups
  * by a spinlock. This matches the semantics of all the wait queues used in the