US STOCKS-Wall St slips as oil rally fades, earnings worries mount
* U.S. stocks briefly turn negative
* Crude oil slips on report of higher stockpiles
* Tech stocks weigh, Apple biggest drag on market
* Yum Brands hit by China woes, drags McDonald's
* Indexes up: Dow 0.15 pct, S&P 0.20 pct, Nasdaq 0.07 pct (Updates to early afternoon)
By Tanya Agrawal
Oct 7 (Reuters) - U.S. stocks were marginally higher in volatile trading on Wednesday as investor worries about corporate earnings grew and a rally in crude oil prices ended.
Crude oil prices seesawed after government data showing a large U.S. crude inventory build surprised traders the morning after an industry group had reported a draw.
The S&P energy index, earlier the best performing among the 10 major S&P sectors, was up 0.13 percent - the smallest gain among the six advancing S&P sectors. Continuación...