xfs: remove xfs_buf wrappers

Stop having two different names for many buffer functions and use
the more descriptive xfs_buf_* names directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
diff --git a/fs/xfs/xfs_dir2_leaf.c b/fs/xfs/xfs_dir2_leaf.c
index 504be86..ae89122 100644
--- a/fs/xfs/xfs_dir2_leaf.c
+++ b/fs/xfs/xfs_dir2_leaf.c
@@ -961,7 +961,7 @@
 				if (i > ra_current &&
 				    map[ra_index].br_blockcount >=
 				    mp->m_dirblkfsbs) {
-					xfs_baread(mp->m_ddev_targp,
+					xfs_buf_readahead(mp->m_ddev_targp,
 						XFS_FSB_TO_DADDR(mp,
 						   map[ra_index].br_startblock +
 						   ra_offset),