SHANGHAI (Reuters) - Apple Inc managed to largely stem a fall in China revenue in the September quarter thanks to the release-timing of the iPhone 11, a cheaper variant, and a bit of good luck, but analysts said the company's good fortunes might be short-lived.Apple said sales in greater China fell 2.4% in its fourth quarter ended Sept. 30, a far cry from the 27% drop it saw in the first quarter this year - a fact that Chief Executive Tim Cook played up on the company's post-earnings call on..