Nikkei little changed after mixed tankan data

* Tankan result gives limited impact to stock market - analysts * Selling in emerging market currencies can be a threat to Japanese market - analyst * Ibiden tumbles after cutting profit outlook By Ayai Tomisawa TOKYO, Oct 1 (Reuters) - Japan's Nikkei share average was little changed in choppy trade on Wednesday, with a weak yen supporting sentiment despite mixed data from the Bank Of Japan's tankan survey. Business confidence among Japanese manufacturers improved for the fi