ocfs2: Access the right buffer_head in ocfs2_merge_rec_left.

In commit "ocfs2: Use metadata-specific ocfs2_journal_access_*()
functions", the wrong buffer_head is accessed. So change it
to the right buffer_head.
Signed-off-by: NTao Ma <tao.ma@oracle.com>
Acked-by: NJoel Becker <joel.becker@oracle.com>
Signed-off-by: NMark Fasheh <mfasheh@suse.com>

fs/ocfs2/alloc.c

@@ -3402,8 +3402,8 @@ static int ocfs2_merge_rec_left(struct inode *inode,
 			has_empty_extent = 1;
 	}
 
-	ret = ocfs2_path_bh_journal_access(handle, inode, left_path,
-					   path_num_items(left_path) - 1);
+	ret = ocfs2_path_bh_journal_access(handle, inode, right_path,
+					   path_num_items(right_path) - 1);
 	if (ret) {
 		mlog_errno(ret);
 		goto out;