xfs: fix various typos

Signed-off-by: Malcolm Parsons <malcolm.parsons@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/xfs/xfs_da_btree.h b/fs/xfs/xfs_da_btree.h
index 41f27b3..8c53616 100644
--- a/fs/xfs/xfs_da_btree.h
+++ b/fs/xfs/xfs_da_btree.h
@@ -185,7 +185,7 @@
 	unsigned char		inleaf;		/* insert into 1->lf, 0->splf */
 	unsigned char		extravalid;	/* T/F: extrablk is in use */
 	unsigned char		extraafter;	/* T/F: extrablk is after new */
-	xfs_da_state_blk_t	extrablk;	/* for double-splits on leafs */
+	xfs_da_state_blk_t	extrablk;	/* for double-splits on leaves */
 						/* for dirv2 extrablk is data */
 } xfs_da_state_t;