xfs: fix compiler warnings

Fix up all the compiler warnings that have crept in.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
index ef2c137..e0a0af0 100644
--- a/fs/xfs/xfs_buf_item.c
+++ b/fs/xfs/xfs_buf_item.c
@@ -570,7 +570,9 @@
 	bool			aborted = !!(lip->li_flags & XFS_LI_ABORTED);
 	bool			hold = !!(bip->bli_flags & XFS_BLI_HOLD);
 	bool			dirty = !!(bip->bli_flags & XFS_BLI_DIRTY);
+#if defined(DEBUG) || defined(XFS_WARN)
 	bool			ordered = !!(bip->bli_flags & XFS_BLI_ORDERED);
+#endif
 
 	/* Clear the buffer's association with this transaction. */
 	bp->b_transp = NULL;