[JFFS2] Print correct node offset when complaining about broken data CRC

Debugging the hardware problems in OLPC trac #1905 would be a whole lot
easier if the correct node offsets were printed for the offending nodes.
Signed-off-by: David Woodhouse <dwmw2@infradead.org>

fs/jffs2/readinode.c

@@ -104,7 +104,7 @@ static int check_node_data(struct jffs2_sb_info *c, struct jffs2_tmp_dnode_info
 
 	if (crc != tn->data_crc) {
 		JFFS2_NOTICE("wrong data CRC in data node at 0x%08x: read %#08x, calculated %#08x.\n",
-			ofs, tn->data_crc, crc);
+			     ref_offset(ref), tn->data_crc, crc);
 		return 1;
 	}