Nikkei extends fall on Shiozaki comments, gets little help from China data

* Investors use minister's comments to book Monday's gains * China growth figures compound lingering global economic fears * Steel, machinery and shipping shares hit (Recasts, updates Nikkei level, market reaction) By Thomas Wilson TOKYO, Oct 21 (Reuters) - Japanese stocks fell on Tuesday, with the market latching on to comments from the welfare minister on the country's public pension fund as an excuse to take profits from outsized gains the previous day. The Nikkei share