UPDATE 1-Kenyan shilling firms, stocks down on profit-taking

* Bond sale buoys shilling * BAT, Safaricom lead stocks lower (Adds shilling closing rate, stocks, bonds) By George Obulutsa NAIROBI, Dec 17 (Reuters) - The Kenyan shilling firmed on Wednesday helped by hard currency inflows from offshore investor seeking to buy government bonds, while stocks fell on profit-taking. The shilling closed at 90.35/45 to the dollar, compared with Tuesday's close of 90.55/65. "It must have been to lack of (dollar) demand... Also, some interest o